如何检查连接字符串是否有效？

Question

我必须保存数据,我必须先测试连接才能保存.如何测试此连接字符串对特定连接是否有效？

我的代码是这样的:

static public bool TestConnString(string connectionString)
{
    bool returnVal = true;
    using (SqlConnection conn = new SqlConnection(connectionString))
    {
        try
        {
            conn.Open();

            if (conn.State != ConnectionState.Open)
                returnVal = false;
            else
                returnVal = true;
        }
        catch (Exception ex)
        {
            returnVal = false;
        }
    }

    return returnVal;
}

连接字符串是:

Data Source=testSvr03\SQLEXPRESS;Initial Catalog=Test; Connection Timeout=600; Persist Security Info=True;User ID=Test; password=test 

如果我在连接字符串中给出错误的数据源,那么在conn.open()之后它永远不会在这个函数中返回.我把catch块但是它进来了

谁能告诉我什么是解决方案？

Answer 1

您可以让SqlConnectionStringBuilder构造函数检查它:

bool isValidConnectionString = true;
try{
    var con = new SqlConnectionStringBuilder("ABC");
}catch(Exception)
{
    // can be KeyNotFoundException, FormatException, ArgumentException
    isValidConnectionString = false;
}

下面是一个概述的ConnectionStringBuilders为不同数据提供者:

Provider                   ConnectionStringBuilder 
System.Data.SqlClient      System.Data.SqlClient.SqlConnectionStringBuilder
System.Data.OleDb          System.Data.OleDb.OleDbConnectionStringBuilder
System.Data.Odbc           System.Data.Odbc.OdbcConnectionStringBuilder
System.Data.OracleClient   System.Data.OracleClient.OracleConnectionStringBuilder

Answer 2

您可以将return语句放在catch块中,就像这样

static bool TestConnectionString(string connectionString)
{
    using (MySqlConnection conn = new MySqlConnection(connectionString))
    {
        try
        {
            conn.Open();

            return (conn.State == ConnectionState.Open);
        }
        catch
        {
            return false;
        }
    }
    return false;
}

我刚试过这个.如果使用空字符串调用此函数,它可以正常工作(返回false值).