asp.net - 选择此代码之前的概念（@）是什么？

Question

选择此代码之前的概念（@）是什么？受保护的无效btnSearch_Click（对象发送者，EventArgs e）{

    SqlDataSource2.SelectCommand = **@**"SELECT tblstore.storname,tblproduct.pid, tblproduct.pname, tblproduct.pprice, tblproduct.publisher, tblproduct.writer FROM tblproduct INNER JOIN tblstore ON tblproduct.storeid = tblstore.storeid WHERE tblproduct.pname LIKE @ likeText;";


    SqlDataSource2.SelectParameters.Add("likeText", txtName.Text);



    GridView1.EmptyDataText = "not result";

}

Answer 1

删除命令文本之间@和之间的空格likeText

SqlDataSource2.SelectCommand = @"SELECT tblstore.storname,tblproduct.pid, tblproduct.pname, tblproduct.pprice, tblproduct.publisher, tblproduct.writer FROM tblproduct INNER JOIN tblstore ON tblproduct.storeid = tblstore.storeid WHERE tblproduct.pname LIKE @likeText";

并像这样添加参数值

SqlDataSource2.SelectParameters.Add("@likeText","%" + txtName.Text + "%");