Merge pull request #77 from maikebing/main

支持.Net 4.6.1 和 .Net  Standard 2.0

Author: lausannel

README.md

@@ -31,26 +31,17 @@ This is the C# client of Apache IoTDB.
 Apache IoTDB website: https://iotdb.apache.org
 Apache IoTDB Github: https://github.com/apache/iotdb
 
-## Starting from `.net framework 4.x`
-In order to adapt to `.net framework 4.x`, we have packaged a nuget package separately, the package name is [`Apache.IoTDB.framework`](https://www.nuget.org/packages/Apache.IoTDB.framework/). 
-
-You can install it through Package Manager (PM), .NET CLI, etc. For example (.NET CLI):
-
-```sh
-dotnet add package Apache.IoTDB.framework --version 0.12.1.2
-```
-
 ## Installation
 
 ### Install from NuGet Package
 
-We have prepared Nuget Package for C# users who are using `.net 5.0` or higher version. Users can directly install the client through .NET CLI. [The link of our NuGet Package is here](https://www.nuget.org/packages/Apache.IoTDB/). Run the following command in the command line to complete installation
+We have prepared Nuget Package for C# users. Users can directly install the client through .NET CLI. [The link of our NuGet Package is here](https://www.nuget.org/packages/Apache.IoTDB/). Run the following command in the command line to complete installation
 
 ```sh
 dotnet add package Apache.IoTDB
 ```
 
-Note that the `Apache.IoTDB` package only supports `.net 5.0` or higher version. If you are using `.net framework 4.x`, please refer to the section [starting from .net framework 4.x](#starting-from-net-framework-4x).
+Note that the `Apache.IoTDB` package only supports `.net 5.0`. If you are using `.net framework 4.x`, please refer to the section [starting from .net framework 4.x](#starting-from-net-framework-4x).
 
 ## Prerequisites
 
@@ -76,4 +67,13 @@ NLog >= 4.7.9
 ### Command Line Tools
 
 ## Publish your own client on nuget.org
-You can find out how to publish from this [doc](./PUBLISH.md).
+You can find out how to publish from this [doc](./PUBLISH.md).
+
+## Starting from `.net framework 4.x`
+In order to adapt to `.net framework 4.x`, we have packaged a nuget package separately, the package name is [`Apache.IoTDB.framework`](https://www.nuget.org/packages/Apache.IoTDB.framework/). 
+
+You can install it through Package Manager (PM), .NET CLI, etc. For example (.NET CLI):
+
+```sh
+dotnet add package Apache.IoTDB.framework --version 0.12.1.2
+```

src/Apache.IoTDB.Data/Apache - Backup (1).IoTDB.Data.csproj

@@ -16,7 +16,7 @@
 			Apache.IoTDB.Data.IoTDBParameter
 			Apache.IoTDB.Data.IoTDBTransaction
 		</Description>
-		<TargetFrameworks>net5;net6;netstandard2.1</TargetFrameworks>
+		<TargetFrameworks>net5.0;net6.0;netstandard2.1;netstandard2.0;net461</TargetFrameworks>
 		<LangVersion>10</LangVersion>
 		<PackageReleaseNotes>Apache.IoTDB.Data  是一个TDengine 的ADO.Net 提供器。 这将允许你通过.Net  访问IoTDB数据库。		</PackageReleaseNotes>
 	</PropertyGroup>

src/Apache.IoTDB.Data/Apache - Backup.IoTDB.Data.csproj

@@ -188,7 +188,11 @@ public override void Close()
         {
             CloseAsync().GetAwaiter().GetResult(); ;
         }
+#if NET461_OR_GREATER || NETSTANDARD2_0
+        public  async Task CloseAsync()
+#else
         public override async Task CloseAsync()
+#endif
         { 
             if (State != ConnectionState.Closed)
                 await  _IoTDB.Close();