c# - C#mysql示例Command.ExecuteReader抛出异常

我正在写一段C代码，从MySQL数据库中获取一些数据。我从现成的示例开始，但它在rdr = cmd.ExecuteReader()处给了我一个错误。
抛出的异常的屏幕截图如下所示

using System;
using MySql.Data.MySqlClient;

public class Program
{

    static void Main()
    {
            string serverName = "192.168.0.012";
            string port = "1234";
            string db = "cust_db";
            string userID = "root";
            string password = "pass";
            string cs = "Server=" + serverName + ";Port=" + port + ";Database=" + db + ";Uid=" + userID + ";password=" + password;


        MySqlConnection conn = null;
        MySqlDataReader rdr = null;

        try
        {
            conn = new MySqlConnection(cs);
            conn.Open();

            string stm = "SELECT * FROM cust_tb";
            MySqlCommand cmd = new MySqlCommand(stm, conn);
            rdr = cmd.ExecuteReader();

            while (rdr.Read())
            {
                Console.WriteLine(rdr.GetInt32(0) + ": "
                    + rdr.GetString(1));
            }

        } catch (MySqlException ex)
        {
            Console.WriteLine("Error: {0}",  ex.ToString());

        } finally
        {
            if (rdr != null)
            {
                rdr.Close();
            }

            if (conn != null)
            {
                conn.Close();
            }

        }
    }
}


at MySql.Data.MySqlClient.CharSetMap.GetChararcterSet(DBVersion version, String CharSetName)
   at MySql.Data.MySqlClient.NativeDriver.GetFieldMetaData41()
   at MySql.Data.MySqlClient.NativeDriver.GetFieldMetaData()
   at MySql.Data.MySqlClient.NativeDriver.ReadColumnMetadata(Int32 count)
   at MySql.Data.MySqlClient.MySqlDataReader.NextResult()
   at MySql.Data.MySqlClient.MySqlCommand.ExecuteReader(CommandBehavior behavior)
   at MySql.Data.MySqlClient.MySqlCommand.ExecuteReader()
   at Program.Main() in c:\Users\omran.alhammadi\Desktop\csMysqlConnection\csMysqlConnection\Program.cs:line 28
   at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
   at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
   at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
   at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ThreadHelper.ThreadStart()</StackTrace><ExceptionString>System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.
   at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
   at MySql.Data.MySqlClient.CharSetMap.GetChararcterSet(DBVersion version, String CharSetName)
   at MySql.Data.MySqlClient.NativeDriver.GetFieldMetaData41()
   at MySql.Data.MySqlClient.NativeDriver.GetFieldMetaData()
   at MySql.Data.MySqlClient.NativeDriver.ReadColumnMetadata(Int32 count)
   at MySql.Data.MySqlClient.MySqlDataReader.NextResult()
   at MySql.Data.MySqlClient.MySqlCommand.ExecuteReader(CommandBehavior behavior)
   at MySql.Data.MySqlClient.MySqlCommand.ExecuteReader()
   at Program.Main() in c:\Users\omran.alhammadi\Desktop\csMysqlConnection\csMysqlConnection\Program.cs:line 28
   at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
   at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
   at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
   at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ThreadHelper.ThreadStart()</ExceptionString></Exception></TraceRecord>
An unhandled exception of type 'System.Collections.Generic.KeyNotFoundException' occurred in mscorlib.dll
Additional information: The given key was not present in the dictionary.
The program '[17084] csMysqlConnection.vshost.exe: Managed (v4.0.30319)' has exited with code -1 (0xffffffff).

最佳答案

我一直有这个问题，我做了一些研究。过了一会儿，我刚解决了这个问题。
我的问题是数据库表编码。我有utf32_unicode_ci，我把它改成了utf8_unicode_ci。现在工作得很好。
希望你运气好。

关于c# - C#mysql示例Command.ExecuteReader抛出异常，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/13716450/