运算符"+"不能应用于类型“方法组"和字符串[错误]的操作数 [英] Operator '+' cannot be applied to operands of type 'method group' and string [error]

问题描述

对于此代码，我遇到错误，有任何解决方法吗?

Somehow for this code I''m getting an error, any workaround?

protected void calArticles_SelectionChanged(object sender, EventArgs e)
{
    SqlDataSource1.ConnectionString = 
        System.String.Concat(
        "SELECT [Timestamp], [Subject], [EntryText] FROM [Article] WHERE [Timestamp] = "
        ,calArticles.SelectedDate.ToString + ";");
        
}

错误消息:

错误2运算符"+"不能应用于类型为方法组"和字符串"的操作数c:\ inetpub \ wwwroot \ Jon's Couch \ Articles.aspx.cs 24 14 http://localhost/Jon's Couch/

Error 2 Operator ''+'' cannot be applied to operands of type ''method group'' and ''string'' c:\inetpub\wwwroot\Jon''s Couch\Articles.aspx.cs 24 14 http://localhost/Jon''s Couch/

:confused:

:confused:

推荐答案

ToString是一种方法.与ToString()中一样，使用()调用方法.买一本C#书并阅读.您也不应在表示层中使用字符串混搭SQL，如果您想编写可伸缩且可维护的代码，也不要这样做.

ToString is a method. Use () to call a method, as in ToString(). Buy a C# book and read it. You should also not be string mashing SQL in your presentation layer, not if you want to write scalable and maintainable code.

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