fix: serialization of \n, \r and \t to Line Protocol, = is valid sign for measurement name

CHANGELOG.md

@@ -1,7 +1,10 @@
 ## 1.10.0 [unreleased]
 
 ### Features
-1. [#23](https://github.com/influxdata/influxdb-client-csharp/pull/102): Added WriteApiAsync for asynchronous write without batching
+1. [#102](https://github.com/influxdata/influxdb-client-csharp/pull/102): Added WriteApiAsync for asynchronous write without batching
+
+### Bug Fixes
+1. [#106](https://github.com/influxdata/influxdb-client-csharp/pull/106): Fixed serialization of `\n`, `\r` and `\t` to Line Protocol 
 
 ## 1.9.0 [2020-06-19]
 

Client.Test/PointDataTest.cs

@@ -21,6 +21,18 @@ public void TagEmptyTagValue()
             Assert.AreEqual("h2o,location=europe level=2i", point.ToLineProtocol());
         }
 
+        [Test]
+        public void TagEscapingKeyAndValue() {
+
+            var point = PointData.Measurement("h\n2\ro\t_data")
+                .Tag("new\nline", "new\nline")
+                .Tag("carriage\rreturn", "carriage\rreturn")
+                .Tag("t\tab", "t\tab")
+                .Field("level", 2);
+
+            Assert.AreEqual("h\\n2\\ro\\t_data,carriage\\rreturn=carriage\\rreturn,new\\nline=new\\nline,t\\tab=t\\tab level=2i", point.ToLineProtocol());
+        }
+
         [Test]
         public void Immutability()
         {

Client/Writes/PointData.cs

@@ -475,6 +475,15 @@ private void EscapeKey(StringBuilder sb, string key)
             {
                 switch (c)
                 {
+                    case '\n':
+                        sb.Append("\\n");
+                        continue;
+                    case '\r':
+                        sb.Append("\\r");
+                        continue;
+                    case '\t':
+                        sb.Append("\\t");
+                        continue;
                     case ' ':
                     case ',':
                     case '=':