Question

我正在尝试使用数据库中的值自动完成textBox。当我进行子弹测试时，代码将一直走到下面函数中的if语句。有人可以告诉我为什么我的代码在if之后不会执行吗？

我正在尝试运行以下内容，但它会在if：

之前跳出来

public AutoCompleteStringCollection AutoCompleate(string dataBase, string procedure)
{
        AutoCompleteStringCollection namesCollection =
            new AutoCompleteStringCollection();

        SqlDataReader dReader;
        SqlCommand cmd = new SqlCommand(procedure, con);
        cmd.CommandType = CommandType.StoredProcedure;
        con.Open();
        dReader = cmd.ExecuteReader(); // This is the last place my bullet check 
                                       // gets before it hop's out!
        if (dReader.HasRows == true)
        {
            while (dReader.Read())
                namesCollection.Add(dReader["SystemUser"].ToString());
        }
        con.Close();
        dReader.Close();
        return namesCollection;
    }

其他信息，但请关注上述内容！

请询问您是否需要任何信息。：）

致电上述内容：

textBoxUser.AutoCompleteMode = AutoCompleteMode.Suggest;
textBoxUser.AutoCompleteSource = AutoCompleteSource.CustomSource;
textBoxUser.AutoCompleteCustomSource = 
    DatabaseService.Instance.AutoCompleate("AuditIT", "AutoCompleate");

存储过程

USE [AuditIT]
GO

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
--Allow textboxs to have a autocomplete
 ALTER procedure [dbo].[AutoCompleate] 
 as

 Select distinct SystemUser from SchemaAudit
             order by SystemUser asc

Answer 1

当您尝试命中数据库时，存在未处理的异常。尝试重构代码：

try{

if (dataBase.Length > 0) { procedure = dataBase + ".." + procedure; } //Set procedure to DBNAME..ProcedureName

SqlDataReader dReader;
            SqlCommand cmd = new SqlCommand(procedure, con);
            cmd.CommandType = CommandType.StoredProcedure;
            con.Open();
            dReader = cmd.ExecuteReader(); // This is the last place my bullet check gets before it hop's out!
            if (dReader.HasRows == true)
            {
                while (dReader.Read())
                    namesCollection.Add(dReader["SystemUser"].ToString());
            }
            con.Close();
            dReader.Close();
}
catch(Exception e)
{
    // handle the exception better than me :)
    Console.WriteLine(e.Message);
}

在console.WriteLine上放置一个消息框或断点，看看发生了什么。

为什么这不起作用？不执行代码？

1 个答案: