Why it doesn't work when I use MysqlConnection.open()? [closed]

问题:

  using System;     using System.Collections.Generic;     using System.Linq; using System.Text; using MySql.Data.MySqlClient;   namespace dbTest {     class Program     {         static void Main(string[] args)         {          string sqlStr   = "Database=weather;Server=127.0.0.1;Uid=root;Password=123456;pooling=false;CharSet=UTF8;port=3306";            MySqlConnection mysql = new MySqlConnection(sqlStr);               mysql.Open();               Console.WriteLine("SUCCESS");                mysql.Close();         }     } } 

It will crash when running the sentence "mysql.Open()"

does anybody know why? the error message is: -unhandled exception:System.Collecions.Generic.KeyNotFoundException:the key is not in the dictionary -in System.Collections.Generic.Dictionary'2.get_Item(TKEY KEY) -in Mysql.Data.MySqlClient.CharSetMap.GetCharacterSet(DBVersion version,String CHARSETNAME) -in Mysql.Data.MySqlClient.CharSetMap.GetEncoding(DVversion version,String CharSetName) -in Mysql.Data.MySqlClient.Driver.Configure(MySqlConnection connection) -in Mysql.Data.MySqlClient.Mysqlconnection.Open() -in dbTest.Program.Main(String[] args) location:blahblah...

回答1:

You're specifying an invalid character set. Take a look at this reference:

Note! Use lower case value utf8 and not upper case UTF8 as this will fail.

The value is case-sensitive and should be lowercase:

Database=weather;Server=127.0.0.1;Uid=root;Password=123456;pooling=false;CharSet=utf8;port=3306 

Admittedly it's an unhelpful error message, but it is what it is I suppose. (This is why reading a stack trace can often be more helpful than the message itself, since it can provide a basis for researching the answer.)

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