我一直在努力寻找解决方案,但仍然没什么好处。
我从后面的代码(以及SqlDataSource)创建一个GridView。在我的页面中有一个DropDownList,其中填充了用户名(后面填充了代码)。
当我在DDL中选择用户名时,GridView应该重新绑定并仅显示属于该特定用户的数据。出于某种原因,我无法使其发挥作用而且我不明白为什么。
这是我的代码:
创建GW和SqlDS:
SqlDataSource SqlDataSourceFormulariDaAppr = new SqlDataSource();
SqlDataSourceFormulariDaAppr.ID = "SqlDataSourceFormulariDaAppr";
this.Page.Controls.Add(SqlDataSourceFormulariDaAppr);
SqlDataSourceFormulariDaAppr.ConnectionString = System.Configuration.ConfigurationManager.ConnectionStrings["MyConnectionString"].ConnectionString;
SqlDataSourceFormulariDaAppr.SelectCommand = "Query";
SqlDataSourceFormulariDaAppr.SelectParameters.Add("userID", DropDownListUtenti.SelectedValue);
SqlDataSourceFormulariDaAppr.DataBind();
GridViewFormulariDaAppr.DataSource = SqlDataSourceFormulariDaAppr;
GridViewFormulariDaAppr.DataBind();
SelectedIndex方法:
protected void DropDownListUtenti_SelectedIndexChanged(object sender, EventArgs e)
{
GridViewFormulariDaAppr.DataBind();
}
非常感谢任何帮助。
答案 0 :(得分:1)
很高兴知道你找到了解决方法。 根据您问题中的代码,进行以下更改将对您有用:
SqlDataSourceFormulariDaAppr.SelectParameters.Clear();
将清除您之前添加的参数
创建GW和SqlDS:
SqlDataSource SqlDataSourceFormulariDaAppr = new SqlDataSource();
SqlDataSourceFormulariDaAppr.ID = "SqlDataSourceFormulariDaAppr";
this.Page.Controls.Add(SqlDataSourceFormulariDaAppr);
SqlDataSourceFormulariDaAppr.ConnectionString = System.Configuration.ConfigurationManager.ConnectionStrings["MyConnectionString"].ConnectionString;
SqlDataSourceFormulariDaAppr.SelectCommand = "Query";
SqlDataSourceFormulariDaAppr.SelectParameters.Add("userID", DropDownListUtenti.SelectedValue);
SqlDataSourceFormulariDaAppr.DataBind();
GridViewFormulariDaAppr.DataSource = SqlDataSourceFormulariDaAppr;
GridViewFormulariDaAppr.DataBind();
SqlDataSourceFormulariDaAppr.SelectParameters.Clear();
SelectedIndex方法:
protected void DropDownListUtenti_SelectedIndexChanged(object sender, EventArgs e)
{
populateGrid();
}
另外,您想添加:
SqlDataSourceFormulariDaAppr.SelectCommandType = SqlDataSourceCommandType.StoredProcedure;
前
SqlDataSourceFormulariDaAppr.SelectCommand = "Query";
答案 1 :(得分:0)
我找到了一种解决方法,可能不是最安全或最好的,但它确实有效。 我从SqlDS中删除了参数并直接在查询中插入了DropDownList选项(我现在写了一个简单的例子),如下所示:
SqlDataSource SqlDataSourceFormulariDaAppr = new SqlDataSource();
SqlDataSourceFormulariDaAppr.ID = "SqlDataSourceFormulariDaAppr";
this.Page.Controls.Add(SqlDataSourceFormulariDaAppr);
SqlDataSourceFormulariDaAppr.ConnectionString = System.Configuration.ConfigurationManager.ConnectionStrings["MyConnectionString"].ConnectionString;
SqlDataSourceFormulariDaAppr.SelectCommand = "SELECT * FROM table WHERE userID = " + DropDownListUtenti.SelectedValue + "";
SqlDataSourceFormulariDaAppr.DataBind();
GridViewFormulariDaAppr.DataSource = SqlDataSourceFormulariDaAppr;
GridViewFormulariDaAppr.DataBind();
答案 2 :(得分:0)
我认为你需要这样的东西:
Parameter param = new Parameter("userID", DbType.String, DropDownListUtenti.SelectedValue);
if (SqlDataSourceFormulariDaAppr.SelectParameters.Contains(param))
{
SqlDataSourceFormulariDaAppr.SelectParameters["userID"] = DropDownListUtenti.SelectedValue;
}
else
{
SqlDataSourceFormulariDaAppr.SelectParameters.Add(param);
}