docs:docs-cn-example csharp fix example code && fix reference ident (#11457)

* docs:docs-cn-example csharp fix example code && fix reference ident

* use 'dotnet format' to correct coding style
Co-authored-by: Shuduo Sang <sangshuduo@gmail.com>

docs-cn/14-reference/03-connector/csharp.mdx

@@ -8,7 +8,7 @@ title: C# Connector
 
 - C# 连接器支持的系统有：Linux 64/Windows x64/Windows x86
 
-- C# 连接器现在也支持从 [Nuget 下载引用](https://www.nuget.org/packages/TDengine.Connector/)
+- C# 连接器支持从 [Nuget 下载引用](https://www.nuget.org/packages/TDengine.Connector/)
 
 - 在 Windows 系统上，C# 应用程序可以使用 TDengine 的原生 C 接口来执行所有数据库操作，后续版本将提供 ORM（Dapper）框架驱动。
 
@@ -26,6 +26,7 @@ title: C# Connector
 - [C# example source code on GitHub](https://github.com/taosdata/TDengine/tree/develop/examples/C%23)
 
 :::note
+
 TDengineTest.cs C# 示例源程序，包含了数据库连接参数，以及如何执行数据插入、查询等操作。
 
 :::

docs-examples/csharp/AsyncQueryExample.cs

@@ -5,7 +5,8 @@ namespace TDengineExample
 {
     public class AsyncQueryExample
     {
-        static void Main() { 
+        static void Main()
+        {
             IntPtr conn = GetConnection();
             QueryAsyncCallback queryAsyncCallback = new QueryAsyncCallback(QueryCallback);
             TDengine.QueryAsync(conn, "select * from meters", queryAsyncCallback, IntPtr.Zero);

docs-examples/csharp/InfluxDBLineExample.cs

@@ -4,7 +4,8 @@ namespace TDengineExample
 {
     internal class InfluxDBLineExample
     {
-        static void Main() {
+        static void Main()
+        {
             IntPtr conn = GetConnection();
             PrepareDatabase(conn);
             string[] lines = {
@@ -52,7 +53,8 @@ namespace TDengineExample
         static void PrepareDatabase(IntPtr conn)
         {
             IntPtr res = TDengine.Query(conn, "CREATE DATABASE test");
-            if (TDengine.ErrorNo(res) != 0) {
+            if (TDengine.ErrorNo(res) != 0)
+            {
                 Console.WriteLine("failed to create database, reason: " + TDengine.Error(res));
                 ExitProgram(conn, 1);
             }

docs-examples/csharp/QueryExample.cs

@@ -5,10 +5,11 @@ namespace TDengineExample
 {
     internal class QueryExample
     {
-        static void Main() { 
+        static void Main()
+        {
             IntPtr conn = GetConnection();
             // run query
-            IntPtr res = TDengine.Query(conn, "SELECT * FROM meters LIMIT 2");
+            IntPtr res = TDengine.Query(conn, "SELECT * FROM test.meters LIMIT 2");
             if (TDengine.ErrorNo(res) != 0)
             {
                 Console.WriteLine("Failed to query since: " + TDengine.Error(res));
@@ -31,11 +32,22 @@ namespace TDengineExample
 
             // print values
             IntPtr row;
-            while ((row = TDengine.FetchRows(res)) != IntPtr.Zero) {
-                for (int i = 0; i < fieldCount; i++) { 
-                    var meta = metas[i];
-                    int offset = IntPtr.Size * i;
-                    IntPtr data = Marshal.ReadIntPtr(row, offset);
+            while ((row = TDengine.FetchRows(res)) != IntPtr.Zero)
+            {
+                List<TDengineMeta> metaList = TDengine.FetchFields(res);
+                int numOfFiled = TDengine.FieldCount(res);
+
+                List<String> dataRaw = new List<string>();
+
+                IntPtr colLengthPrt = TDengine.FetchLengths(res);
+                int[] colLengthArr = new int[numOfFiled];
+                Marshal.Copy(colLengthPrt, colLengthArr, 0, numOfFiled);
+
+                for (int i = 0; i < numOfFiled; i++)
+                {
+                    TDengineMeta meta = metaList[i];
+                    IntPtr data = Marshal.ReadIntPtr(row, IntPtr.Size * i);
+
                     if (data == IntPtr.Zero)
                     {
                         Console.Write("NULL\t");
@@ -45,51 +57,75 @@ namespace TDengineExample
                     {
                         case TDengineDataType.TSDB_DATA_TYPE_BOOL:
                             bool v1 = Marshal.ReadByte(data) == 0 ? false : true;
-                            Console.Write(v1 + "\t"); 
+                            Console.Write(v1.ToString() + "\t");
                             break;
                         case TDengineDataType.TSDB_DATA_TYPE_TINYINT:
-                            byte v2 = Marshal.ReadByte(data);
-                            Console.Write(v2 + "\t");
+                            sbyte v2 = (sbyte)Marshal.ReadByte(data);
+                            Console.Write(v2.ToString() + "\t");
                             break;
                         case TDengineDataType.TSDB_DATA_TYPE_SMALLINT:
                             short v3 = Marshal.ReadInt16(data);
-                            Console.Write(v3 + "\t");
+                            Console.Write(v3.ToString() + "\t");
                             break;
                         case TDengineDataType.TSDB_DATA_TYPE_INT:
                             int v4 = Marshal.ReadInt32(data);
-                            Console.Write(v4 + "\t");
+                            Console.Write(v4.ToString() + "\t");
                             break;
                         case TDengineDataType.TSDB_DATA_TYPE_BIGINT:
                             long v5 = Marshal.ReadInt64(data);
-                            Console.Write(v5 + "\t");
+                            Console.Write(v5.ToString() + "\t");
                             break;
                         case TDengineDataType.TSDB_DATA_TYPE_FLOAT:
                             float v6 = (float)Marshal.PtrToStructure(data, typeof(float));
-                            Console.Write(v6 + "\t");
+                            Console.Write(v6.ToString() + "\t");
                             break;
                         case TDengineDataType.TSDB_DATA_TYPE_DOUBLE:
                             double v7 = (double)Marshal.PtrToStructure(data, typeof(double));
-                            Console.WriteLine(v7 + "\t");
+                            Console.Write(v7.ToString() + "\t");
                             break;
                         case TDengineDataType.TSDB_DATA_TYPE_BINARY:
-                            string v8 = Marshal.PtrToStringAnsi(data);
+                            string v8 = Marshal.PtrToStringUTF8(data, colLengthArr[i]);
                             Console.Write(v8 + "\t");
                             break;
                         case TDengineDataType.TSDB_DATA_TYPE_TIMESTAMP:
                             long v9 = Marshal.ReadInt64(data);
-                            Console.Write(v9 + "\t");
+                            Console.Write(v9.ToString() + "\t");
                             break;
                         case TDengineDataType.TSDB_DATA_TYPE_NCHAR:
-                            string v10 = Marshal.PtrToStringAnsi(data);
+                            string v10 = Marshal.PtrToStringUTF8(data, colLengthArr[i]);
                             Console.Write(v10 + "\t");
                             break;
+                        case TDengineDataType.TSDB_DATA_TYPE_UTINYINT:
+                            byte v12 = Marshal.ReadByte(data);
+                            Console.Write(v12.ToString() + "\t");
+                            break;
+                        case TDengineDataType.TSDB_DATA_TYPE_USMALLINT:
+                            ushort v13 = (ushort)Marshal.ReadInt16(data);
+                            Console.Write(v13.ToString() + "\t");
+                            break;
+                        case TDengineDataType.TSDB_DATA_TYPE_UINT:
+                            uint v14 = (uint)Marshal.ReadInt32(data);
+                            Console.Write(v14.ToString() + "\t");
+                            break;
+                        case TDengineDataType.TSDB_DATA_TYPE_UBIGINT:
+                            ulong v15 = (ulong)Marshal.ReadInt64(data);
+                            Console.Write(v15.ToString() + "\t");
+                            break;
+                        case TDengineDataType.TSDB_DATA_TYPE_JSONTAG:
+                            string v16 = Marshal.PtrToStringUTF8(data, colLengthArr[i]);
+                            Console.Write(v16 + "\t");
+                            break;
+                        default:
+                            Console.Write("nonsupport data type value");
+                            break;
                     }
+
                 }
                 Console.WriteLine();
             }
             if (TDengine.ErrorNo(res) != 0)
             {
-                Console.WriteLine($"Query is not complete, Error { TDengine.ErrorNo(res)} {TDengine.Error(res)}");
+                Console.WriteLine($"Query is not complete, Error {TDengine.ErrorNo(res)} {TDengine.Error(res)}");
             }
             // exit
             TDengine.FreeResult(res);

docs-examples/csharp/SQLInsertExample.cs

@@ -26,7 +26,8 @@ namespace TDengineExample
             ExitProgram(conn, 0);
         }
 
-        static IntPtr GetConnection() {
+        static IntPtr GetConnection()
+        {
             string host = "localhost";
             short port = 6030;
             string username = "root";
@@ -45,7 +46,8 @@ namespace TDengineExample
             return conn;
         }
 
-        static void CheckRes(IntPtr conn, IntPtr res, String errorMsg) {
+        static void CheckRes(IntPtr conn, IntPtr res, String errorMsg)
+        {
             if (TDengine.ErrorNo(res) != 0)
             {
                 Console.Write(errorMsg + " since: " + TDengine.Error(res));

docs-examples/csharp/StmtInsertExample.cs

@@ -12,7 +12,8 @@ namespace TDengineExample
             PrepareSTable();
             // 1. init and prepare
             stmt = TDengine.StmtInit(conn);
-            if (stmt == IntPtr.Zero) {
+            if (stmt == IntPtr.Zero)
+            {
                 Console.WriteLine("failed to init stmt, " + TDengine.Error(stmt));
                 ExitProgram();
             }
@@ -20,7 +21,7 @@ namespace TDengineExample
             CheckStmtRes(res, "failed to prepare stmt");
 
             // 2. bind table name and tags
-            TAOS_BIND[] tags =  new TAOS_BIND[2] {TaosBind.BindBinary("Beijing.Chaoyang"), TaosBind.BindInt(2) };
+            TAOS_BIND[] tags = new TAOS_BIND[2] { TaosBind.BindBinary("Beijing.Chaoyang"), TaosBind.BindInt(2) };
             res = TDengine.StmtSetTbnameTags(stmt, "d1001", tags);
             CheckStmtRes(res, "failed to bind table name and tags");
 
@@ -71,7 +72,8 @@ namespace TDengineExample
 
 
 
-        static void PrepareSTable() {
+        static void PrepareSTable()
+        {
             IntPtr res = TDengine.Query(conn, "CREATE DATABASE power");
             CheckResPtr(res, "failed to create database");
             res = TDengine.Query(conn, "USE power");
@@ -86,7 +88,8 @@ namespace TDengineExample
             {
                 Console.WriteLine(errorMsg + ", " + TDengine.StmtErrorStr(stmt));
                 int code = TDengine.StmtClose(stmt);
-                if (code != 0) {
+                if (code != 0)
+                {
                     Console.WriteLine($"falied to close stmt, {code} reason: {TDengine.StmtErrorStr(stmt)} ");
                 }
                 ExitProgram();