概念是什么（@）在选择此代码之前？

Question

概念是什么（@）选择此代码之前？     protected void btnSearch_Click（object sender，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

从命令文本

中删除@和likeText之间的空格

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";

并添加像这样的参数值

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