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RenderMichaelRenderMichael
authoredFeb 3, 2025··
[dotnet] Handle nullability on WebElement (#15225)
·
selenium-4.31.0nightly
1 parent 421680f commit 480d3c7

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4 files changed

+97
-130
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4 files changed

+97
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Diff for: ‎dotnet/src/webdriver/ILocatable.cs

+2
Original file line numberDiff line numberDiff line change
@@ -20,6 +20,8 @@
2020
using OpenQA.Selenium.Interactions.Internal;
2121
using System.Drawing;
2222

23+
#nullable enable
24+
2325
namespace OpenQA.Selenium
2426
{
2527
/// <summary>

Diff for: ‎dotnet/src/webdriver/ITakesScreenshot.cs

+2
Original file line numberDiff line numberDiff line change
@@ -17,6 +17,8 @@
1717
// under the License.
1818
// </copyright>
1919

20+
#nullable enable
21+
2022
namespace OpenQA.Selenium
2123
{
2224
/// <summary>

Diff for: ‎dotnet/src/webdriver/WebElement.cs

+71-100
Original file line numberDiff line numberDiff line change
@@ -40,28 +40,24 @@ public class WebElement : IWebElement, IFindsElement, IWrapsDriver, ILocatable,
4040
/// </summary>
4141
public const string ElementReferencePropertyName = "element-6066-11e4-a52e-4f735466cecf";
4242

43-
private WebDriver driver;
44-
private string elementId;
43+
private readonly WebDriver driver;
4544

4645
/// <summary>
4746
/// Initializes a new instance of the <see cref="WebElement"/> class.
4847
/// </summary>
4948
/// <param name="parentDriver">The <see cref="WebDriver"/> instance that is driving this element.</param>
5049
/// <param name="id">The ID value provided to identify the element.</param>
51-
/// <exception cref="ArgumentNullException">If <paramref name="id"/> is <see langword="null"/>.</exception>
50+
/// <exception cref="ArgumentNullException">If <paramref name="parentDriver"/> or <paramref name="id"/> are <see langword="null"/>.</exception>
5251
public WebElement(WebDriver parentDriver, string id)
5352
{
54-
this.driver = parentDriver;
55-
this.elementId = id ?? throw new ArgumentNullException(nameof(id));
53+
this.driver = parentDriver ?? throw new ArgumentNullException(nameof(parentDriver));
54+
this.Id = id ?? throw new ArgumentNullException(nameof(id));
5655
}
5756

5857
/// <summary>
5958
/// Gets the <see cref="IWebDriver"/> driving this element.
6059
/// </summary>
61-
public IWebDriver WrappedDriver
62-
{
63-
get { return this.driver; }
64-
}
60+
public IWebDriver WrappedDriver => this.driver;
6561

6662
/// <summary>
6763
/// Gets the tag name of this element.
@@ -77,8 +73,10 @@ public virtual string TagName
7773
get
7874
{
7975
Dictionary<string, object> parameters = new Dictionary<string, object>();
80-
parameters.Add("id", this.elementId);
76+
parameters.Add("id", this.Id);
77+
8178
Response commandResponse = this.Execute(DriverCommand.GetElementTagName, parameters);
79+
8280
return commandResponse.Value.ToString();
8381
}
8482
}
@@ -93,8 +91,10 @@ public virtual string Text
9391
get
9492
{
9593
Dictionary<string, object> parameters = new Dictionary<string, object>();
96-
parameters.Add("id", this.elementId);
94+
parameters.Add("id", this.Id);
95+
9796
Response commandResponse = this.Execute(DriverCommand.GetElementText, parameters);
97+
9898
return commandResponse.Value.ToString();
9999
}
100100
}
@@ -110,9 +110,11 @@ public virtual bool Enabled
110110
get
111111
{
112112
Dictionary<string, object> parameters = new Dictionary<string, object>();
113-
parameters.Add("id", this.elementId);
113+
parameters.Add("id", this.Id);
114+
114115
Response commandResponse = this.Execute(DriverCommand.IsElementEnabled, parameters);
115-
return (bool)Convert.ChangeType(commandResponse.Value, typeof(bool));
116+
117+
return Convert.ToBoolean(commandResponse.Value);
116118
}
117119
}
118120

@@ -127,9 +129,11 @@ public virtual bool Selected
127129
get
128130
{
129131
Dictionary<string, object> parameters = new Dictionary<string, object>();
130-
parameters.Add("id", this.elementId);
132+
parameters.Add("id", this.Id);
133+
131134
Response commandResponse = this.Execute(DriverCommand.IsElementSelected, parameters);
132-
return (bool)Convert.ChangeType(commandResponse.Value, typeof(bool));
135+
136+
return Convert.ToBoolean(commandResponse.Value);
133137
}
134138
}
135139

@@ -142,10 +146,11 @@ public virtual Point Location
142146
{
143147
get
144148
{
145-
string getLocationCommand = DriverCommand.GetElementRect;
146149
Dictionary<string, object> parameters = new Dictionary<string, object>();
147150
parameters.Add("id", this.Id);
148-
Response commandResponse = this.Execute(getLocationCommand, parameters);
151+
152+
Response commandResponse = this.Execute(DriverCommand.GetElementRect, parameters);
153+
149154
Dictionary<string, object> rawPoint = (Dictionary<string, object>)commandResponse.Value;
150155
int x = Convert.ToInt32(rawPoint["x"], CultureInfo.InvariantCulture);
151156
int y = Convert.ToInt32(rawPoint["y"], CultureInfo.InvariantCulture);
@@ -161,10 +166,11 @@ public virtual Size Size
161166
{
162167
get
163168
{
164-
string getSizeCommand = DriverCommand.GetElementRect;
165169
Dictionary<string, object> parameters = new Dictionary<string, object>();
166170
parameters.Add("id", this.Id);
167-
Response commandResponse = this.Execute(getSizeCommand, parameters);
171+
172+
Response commandResponse = this.Execute(DriverCommand.GetElementRect, parameters);
173+
168174
Dictionary<string, object> rawSize = (Dictionary<string, object>)commandResponse.Value;
169175
int width = Convert.ToInt32(rawSize["width"], CultureInfo.InvariantCulture);
170176
int height = Convert.ToInt32(rawSize["height"], CultureInfo.InvariantCulture);
@@ -183,14 +189,14 @@ public virtual bool Displayed
183189
{
184190
get
185191
{
186-
Response commandResponse = null;
187192
Dictionary<string, object> parameters = new Dictionary<string, object>();
188193
string atom = GetAtom("is-displayed.js");
189194
parameters.Add("script", atom);
190-
parameters.Add("args", new object[] { this.ToElementReference().ToDictionary() });
191-
commandResponse = this.Execute(DriverCommand.ExecuteScript, parameters);
195+
parameters.Add("args", new object[] { ((IWebDriverObjectReference)this).ToDictionary() });
192196

193-
return (bool)Convert.ChangeType(commandResponse.Value, typeof(bool));
197+
Response commandResponse = Execute(DriverCommand.ExecuteScript, parameters);
198+
199+
return Convert.ToBoolean(commandResponse.Value);
194200
}
195201
}
196202

@@ -201,9 +207,9 @@ public virtual Point LocationOnScreenOnceScrolledIntoView
201207
{
202208
get
203209
{
204-
Dictionary<string, object> rawLocation;
205210
object scriptResponse = this.driver.ExecuteScript("var rect = arguments[0].getBoundingClientRect(); return {'x': rect.left, 'y': rect.top};", this);
206-
rawLocation = scriptResponse as Dictionary<string, object>;
211+
212+
Dictionary<string, object> rawLocation = (Dictionary<string, object>)scriptResponse;
207213

208214
int x = Convert.ToInt32(rawLocation["x"], CultureInfo.InvariantCulture);
209215
int y = Convert.ToInt32(rawLocation["y"], CultureInfo.InvariantCulture);
@@ -220,7 +226,9 @@ public virtual string ComputedAccessibleLabel
220226
{
221227
Dictionary<string, object> parameters = new Dictionary<string, object>();
222228
parameters.Add("id", this.Id);
229+
223230
Response commandResponse = this.Execute(DriverCommand.GetComputedAccessibleLabel, parameters);
231+
224232
return commandResponse.Value.ToString();
225233
}
226234
}
@@ -233,12 +241,14 @@ public virtual string ComputedAccessibleRole
233241
get
234242
{
235243
// TODO: Returning this as a string is incorrect. The W3C WebDriver Specification
236-
// needs to be updated to more throughly document the structure of what is returned
244+
// needs to be updated to more thoroughly document the structure of what is returned
237245
// by this command. Once that is done, a type-safe class will be created, and will
238246
// be returned by this property.
239247
Dictionary<string, object> parameters = new Dictionary<string, object>();
240248
parameters.Add("id", this.Id);
249+
241250
Response commandResponse = this.Execute(DriverCommand.GetComputedAccessibleRole, parameters);
251+
242252
return commandResponse.Value.ToString();
243253
}
244254
}
@@ -247,18 +257,12 @@ public virtual string ComputedAccessibleRole
247257
/// Gets the coordinates identifying the location of this element using
248258
/// various frames of reference.
249259
/// </summary>
250-
public virtual ICoordinates Coordinates
251-
{
252-
get { return new ElementCoordinates(this); }
253-
}
260+
public virtual ICoordinates Coordinates => new ElementCoordinates(this);
254261

255262
/// <summary>
256263
/// Gets the internal ID of the element.
257264
/// </summary>
258-
string IWebDriverObjectReference.ObjectReferenceId
259-
{
260-
get { return this.elementId; }
261-
}
265+
string IWebDriverObjectReference.ObjectReferenceId => this.Id;
262266

263267
/// <summary>
264268
/// Gets the ID of the element
@@ -270,10 +274,7 @@ string IWebDriverObjectReference.ObjectReferenceId
270274
/// and the parent driver hosting the element have a need to access the
271275
/// internal element ID. Therefore, we have two properties returning the
272276
/// same value, one scoped as internal, the other as protected.</remarks>
273-
protected string Id
274-
{
275-
get { return this.elementId; }
276-
}
277+
protected string Id { get; }
277278

278279
/// <summary>
279280
/// Clears the content of this element.
@@ -285,7 +286,8 @@ protected string Id
285286
public virtual void Clear()
286287
{
287288
Dictionary<string, object> parameters = new Dictionary<string, object>();
288-
parameters.Add("id", this.elementId);
289+
parameters.Add("id", this.Id);
290+
289291
this.Execute(DriverCommand.ClearElement, parameters);
290292
}
291293

@@ -306,7 +308,8 @@ public virtual void Clear()
306308
public virtual void Click()
307309
{
308310
Dictionary<string, object> parameters = new Dictionary<string, object>();
309-
parameters.Add("id", this.elementId);
311+
parameters.Add("id", this.Id);
312+
310313
this.Execute(DriverCommand.ClickElement, parameters);
311314
}
312315

@@ -335,10 +338,12 @@ public virtual IWebElement FindElement(By by)
335338
public virtual IWebElement FindElement(string mechanism, string value)
336339
{
337340
Dictionary<string, object> parameters = new Dictionary<string, object>();
338-
parameters.Add("id", this.elementId);
341+
parameters.Add("id", this.Id);
339342
parameters.Add("using", mechanism);
340343
parameters.Add("value", value);
344+
341345
Response commandResponse = this.Execute(DriverCommand.FindChildElement, parameters);
346+
342347
return this.driver.GetElementFromResponse(commandResponse);
343348
}
344349

@@ -368,10 +373,12 @@ public virtual ReadOnlyCollection<IWebElement> FindElements(By by)
368373
public virtual ReadOnlyCollection<IWebElement> FindElements(string mechanism, string value)
369374
{
370375
Dictionary<string, object> parameters = new Dictionary<string, object>();
371-
parameters.Add("id", this.elementId);
376+
parameters.Add("id", this.Id);
372377
parameters.Add("using", mechanism);
373378
parameters.Add("value", value);
379+
374380
Response commandResponse = this.Execute(DriverCommand.FindChildElements, parameters);
381+
375382
return this.driver.GetElementsFromResponse(commandResponse);
376383
}
377384

@@ -419,25 +426,17 @@ public virtual string GetAttribute(string attributeName)
419426
Dictionary<string, object> parameters = new Dictionary<string, object>();
420427
string atom = GetAtom("get-attribute.js");
421428
parameters.Add("script", atom);
422-
parameters.Add("args", new object[] { this.ToElementReference().ToDictionary(), attributeName });
429+
parameters.Add("args", new object[] { ((IWebDriverObjectReference)this).ToDictionary(), attributeName });
423430
commandResponse = this.Execute(DriverCommand.ExecuteScript, parameters);
424431

425-
if (commandResponse.Value == null)
426-
{
427-
attributeValue = null;
428-
}
429-
else
430-
{
431-
attributeValue = commandResponse.Value.ToString();
432432

433-
// Normalize string values of boolean results as lowercase.
434-
if (commandResponse.Value is bool)
435-
{
436-
attributeValue = attributeValue.ToLowerInvariant();
437-
}
433+
// Normalize string values of boolean results as lowercase.
434+
if (commandResponse.Value is bool b)
435+
{
436+
return b ? "true" : "false";
438437
}
439438

440-
return attributeValue;
439+
return commandResponse.Value?.ToString();
441440
}
442441

443442
/// <summary>
@@ -455,22 +454,13 @@ public virtual string GetAttribute(string attributeName)
455454
/// </remarks>
456455
public virtual string GetDomAttribute(string attributeName)
457456
{
458-
string attributeValue = string.Empty;
459457
Dictionary<string, object> parameters = new Dictionary<string, object>();
460458
parameters.Add("id", this.Id);
461459
parameters.Add("name", attributeName);
462460

463461
Response commandResponse = this.Execute(DriverCommand.GetElementAttribute, parameters);
464-
if (commandResponse.Value == null)
465-
{
466-
attributeValue = null;
467-
}
468-
else
469-
{
470-
attributeValue = commandResponse.Value.ToString();
471-
}
472462

473-
return attributeValue;
463+
return commandResponse.Value?.ToString();
474464
}
475465

476466
/// <summary>
@@ -482,22 +472,13 @@ public virtual string GetDomAttribute(string attributeName)
482472
/// <exception cref="StaleElementReferenceException">Thrown when the target element is no longer valid in the document DOM.</exception>
483473
public virtual string GetDomProperty(string propertyName)
484474
{
485-
string propertyValue = string.Empty;
486475
Dictionary<string, object> parameters = new Dictionary<string, object>();
487476
parameters.Add("id", this.Id);
488477
parameters.Add("name", propertyName);
489478

490479
Response commandResponse = this.Execute(DriverCommand.GetElementProperty, parameters);
491-
if (commandResponse.Value == null)
492-
{
493-
propertyValue = null;
494-
}
495-
else
496-
{
497-
propertyValue = commandResponse.Value.ToString();
498-
}
499480

500-
return propertyValue;
481+
return commandResponse.Value?.ToString();
501482
}
502483

503484
/// <summary>
@@ -512,19 +493,17 @@ public virtual ISearchContext GetShadowRoot()
512493
parameters.Add("id", this.Id);
513494

514495
Response commandResponse = this.Execute(DriverCommand.GetElementShadowRoot, parameters);
515-
Dictionary<string, object> shadowRootDictionary = commandResponse.Value as Dictionary<string, object>;
516-
if (shadowRootDictionary == null)
496+
if (commandResponse.Value is not Dictionary<string, object> shadowRootDictionary)
517497
{
518498
throw new WebDriverException("Get shadow root command succeeded, but response value does not represent a shadow root.");
519499
}
520500

521-
if (!shadowRootDictionary.ContainsKey(ShadowRoot.ShadowRootReferencePropertyName))
501+
if (!ShadowRoot.TryCreate(this.driver, shadowRootDictionary, out ShadowRoot shadowRoot))
522502
{
523503
throw new WebDriverException("Get shadow root command succeeded, but response value does not have a shadow root key value.");
524504
}
525505

526-
string shadowRootId = shadowRootDictionary[ShadowRoot.ShadowRootReferencePropertyName].ToString();
527-
return new ShadowRoot(this.driver, shadowRootId);
506+
return shadowRoot;
528507
}
529508

530509
/// <summary>
@@ -555,7 +534,7 @@ public virtual string GetCssValue(string propertyName)
555534
public virtual Screenshot GetScreenshot()
556535
{
557536
Dictionary<string, object> parameters = new Dictionary<string, object>();
558-
parameters.Add("id", this.elementId);
537+
parameters.Add("id", this.Id);
559538

560539
// Get the screenshot as base64.
561540
Response screenshotResponse = this.Execute(DriverCommand.ElementScreenshot, parameters);
@@ -601,7 +580,7 @@ public virtual void SendKeys(string text)
601580
// TODO: Remove either "keysToSend" or "value" property, whichever is not the
602581
// appropriate one for spec compliance.
603582
Dictionary<string, object> parameters = new Dictionary<string, object>();
604-
parameters.Add("id", this.elementId);
583+
parameters.Add("id", this.Id);
605584
parameters.Add("text", text);
606585
parameters.Add("value", text.ToCharArray());
607586

@@ -625,7 +604,7 @@ public virtual void Submit()
625604
}
626605
else
627606
{
628-
String script = "/* submitForm */var form = arguments[0];\n" +
607+
string script = "/* submitForm */var form = arguments[0];\n" +
629608
"while (form.nodeName != \"FORM\" && form.parentNode) {\n" +
630609
" form = form.parentNode;\n" +
631610
"}\n" +
@@ -645,7 +624,7 @@ public virtual void Submit()
645624
/// <returns>A string that represents the current <see cref="WebElement"/>.</returns>
646625
public override string ToString()
647626
{
648-
return string.Format(CultureInfo.InvariantCulture, "Element (id = {0})", this.elementId);
627+
return string.Format(CultureInfo.InvariantCulture, "Element (id = {0})", this.Id);
649628
}
650629

651630
/// <summary>
@@ -654,7 +633,7 @@ public override string ToString()
654633
/// <returns>Integer of the hash code for the element</returns>
655634
public override int GetHashCode()
656635
{
657-
return this.elementId.GetHashCode();
636+
return this.Id.GetHashCode();
658637
}
659638

660639
/// <summary>
@@ -664,25 +643,22 @@ public override int GetHashCode()
664643
/// <returns>A boolean if it is equal or not</returns>
665644
public override bool Equals(object obj)
666645
{
667-
IWebElement other = obj as IWebElement;
668-
if (other == null)
646+
if (obj is not IWebElement other)
669647
{
670648
return false;
671649
}
672650

673-
IWrapsElement objAsWrapsElement = obj as IWrapsElement;
674-
if (objAsWrapsElement != null)
651+
if (obj is IWrapsElement objAsWrapsElement)
675652
{
676653
other = objAsWrapsElement.WrappedElement;
677654
}
678655

679-
WebElement otherAsElement = other as WebElement;
680-
if (otherAsElement == null)
656+
if (other is not WebElement otherAsElement)
681657
{
682658
return false;
683659
}
684660

685-
if (this.elementId == otherAsElement.Id)
661+
if (this.Id == otherAsElement.Id)
686662
{
687663
// For drivers that implement ID equality, we can check for equal IDs
688664
// here, and expect them to be equal. There is a potential danger here
@@ -696,7 +672,7 @@ public override bool Equals(object obj)
696672
Dictionary<string, object> IWebDriverObjectReference.ToDictionary()
697673
{
698674
Dictionary<string, object> elementDictionary = new Dictionary<string, object>();
699-
elementDictionary.Add(ElementReferencePropertyName, this.elementId);
675+
elementDictionary.Add(ElementReferencePropertyName, this.Id);
700676
return elementDictionary;
701677
}
702678

@@ -729,7 +705,7 @@ private static string GetAtom(string atomResourceName)
729705

730706
private string UploadFile(string localFile)
731707
{
732-
string base64zip = string.Empty;
708+
string base64zip;
733709
try
734710
{
735711
using (MemoryStream fileUploadMemoryStream = new MemoryStream())
@@ -752,10 +728,5 @@ private string UploadFile(string localFile)
752728
throw new WebDriverException("Cannot upload " + localFile, e);
753729
}
754730
}
755-
756-
private IWebDriverObjectReference ToElementReference()
757-
{
758-
return this as IWebDriverObjectReference;
759-
}
760731
}
761732
}

Diff for: ‎dotnet/src/webdriver/WebElementFactory.cs

+22-30
Original file line numberDiff line numberDiff line change
@@ -20,31 +20,29 @@
2020
using System;
2121
using System.Collections.Generic;
2222

23+
#nullable enable
24+
2325
namespace OpenQA.Selenium
2426
{
2527
/// <summary>
2628
/// Object used to create <see cref="WebElement"/> objects for a remote driver instance.
2729
/// </summary>
2830
public class WebElementFactory
2931
{
30-
private WebDriver driver;
31-
3232
/// <summary>
3333
/// Initializes a new instance of the <see cref="WebElementFactory"/> class.
3434
/// </summary>
3535
/// <param name="parentDriver">The <see cref="WebDriver"/> object used to locate the elements.</param>
36+
/// <exception cref="ArgumentNullException">If <paramref name="parentDriver"/> is <see langword="null"/>.</exception>
3637
public WebElementFactory(WebDriver parentDriver)
3738
{
38-
this.driver = parentDriver;
39+
this.ParentDriver = parentDriver ?? throw new ArgumentNullException(nameof(parentDriver));
3940
}
4041

4142
/// <summary>
4243
/// Gets the <see cref="WebDriver"/> instance used to locate elements.
4344
/// </summary>
44-
protected WebDriver ParentDriver
45-
{
46-
get { return this.driver; }
47-
}
45+
protected WebDriver ParentDriver { get; }
4846

4947
/// <summary>
5048
/// Creates a <see cref="WebElement"/> from a dictionary containing a reference to an element.
@@ -58,53 +56,47 @@ public virtual WebElement CreateElement(Dictionary<string, object> elementDictio
5856
}
5957

6058
/// <summary>
61-
/// Gets a value indicating wether the specified dictionary represents a reference to a web element.
59+
/// Gets a value indicating whether the specified dictionary represents a reference to a web element.
6260
/// </summary>
6361
/// <param name="elementDictionary">The dictionary to check.</param>
6462
/// <returns><see langword="true"/> if the dictionary contains an element reference; otherwise, <see langword="false"/>.</returns>
6563
public bool ContainsElementReference(Dictionary<string, object> elementDictionary)
6664
{
67-
string elementPropertyName;
68-
return this.TryGetElementPropertyName(elementDictionary, out elementPropertyName);
65+
if (elementDictionary == null)
66+
{
67+
throw new ArgumentNullException(nameof(elementDictionary), "The dictionary containing the element reference cannot be null");
68+
}
69+
70+
return elementDictionary.ContainsKey(WebElement.ElementReferencePropertyName);
6971
}
7072

7173
/// <summary>
7274
/// Gets the internal ID associated with the element.
7375
/// </summary>
7476
/// <param name="elementDictionary">A dictionary containing the element reference.</param>
7577
/// <returns>The internal ID associated with the element.</returns>
78+
/// <exception cref="ArgumentNullException">If <paramref name="elementDictionary"/> is <see langword="null"/>.</exception>
79+
/// <exception cref="ArgumentException">If the dictionary does not contain the element reference property name.</exception>
80+
/// <exception cref="InvalidOperationException">If the element property is <see langword="null"/> or <see cref="string.Empty"/>.</exception>
7681
public string GetElementId(Dictionary<string, object> elementDictionary)
7782
{
78-
string elementPropertyName;
79-
if (!this.TryGetElementPropertyName(elementDictionary, out elementPropertyName))
83+
if (elementDictionary == null)
84+
{
85+
throw new ArgumentNullException(nameof(elementDictionary), "The dictionary containing the element reference cannot be null");
86+
}
87+
88+
if (!elementDictionary.TryGetValue(WebElement.ElementReferencePropertyName, out object? elementIdObj))
8089
{
8190
throw new ArgumentException("elementDictionary", "The specified dictionary does not contain an element reference");
8291
}
8392

84-
string elementId = elementDictionary[elementPropertyName].ToString();
93+
string? elementId = elementIdObj.ToString();
8594
if (string.IsNullOrEmpty(elementId))
8695
{
8796
throw new InvalidOperationException("The specified element ID is either null or the empty string.");
8897
}
8998

9099
return elementId;
91100
}
92-
93-
private bool TryGetElementPropertyName(Dictionary<string, object> elementDictionary, out string elementPropertyName)
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{
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if (elementDictionary == null)
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{
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throw new ArgumentNullException(nameof(elementDictionary), "The dictionary containing the element reference cannot be null");
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}
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if (elementDictionary.ContainsKey(WebElement.ElementReferencePropertyName))
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{
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elementPropertyName = WebElement.ElementReferencePropertyName;
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return true;
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}
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elementPropertyName = string.Empty;
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return false;
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}
109101
}
110102
}

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