Question

我遇到的情况是，当我第一次单击gridview的ItemID标题进行降序排序时，它仍然保持升序排序。它只在第二次点击时才会进行降序排序。这是我的代码：

protected void MyDropDown_SelectedIndexChanged(object sender, EventArgs e)
{
    this.ViewState["SortExpression"] = "ItemID";
    this.ViewState["SortDirection"] = "ASC";
    BindMyGrid();
}

public void BindMyGrid()
{        
    string sortExpression = this.ViewState["SortExpression"].ToString();
    string sortDirection = this.ViewState["SortDirection"].ToString();
    string strsql = "SELECT * FROM [MasterTbl]  ORDER BY " + sortExpression + " " + sortDirection + "";
    MyDataSource.SelectCommand = strsql;
}

protected void MyGridView_Sorting(object sender, GridViewSortEventArgs e)
{
    string sortExpression = this.ViewState["SortExpression"].ToString();
    string sortDirection = this.ViewState["SortDirection"].ToString();

    if (sortExpression == e.SortExpression)
    {
        this.ViewState["SortDirection"] = (sortDirection == "ASC") ? "DESC" : "ASC";
    }
    else
    {
        this.ViewState["SortExpression"] = e.SortExpression;
        this.ViewState["SortDirection"] = "ASC";
    }

    this.BindMyGrid();
}

HTML code：

 <asp:GridView ID="MyGridView" runat="server" CssClass="table table-striped table-bordered table-hover" AutoGenerateColumns="False" 
            DataSourceID="MyDataSource"  AllowPaging="true" onpageindexchanging="MyGridView_PageIndexChanging" OnRowDataBound="MyGridView_RowDataBound"
            AllowSorting="true" OnSorting="MyGridView_Sorting" OnRowCreated="MyGridView_RowCreated">
     <Columns>
           <%--Here is where my Boundfield columns are--%>
     <Columns>
     <PagerStyle CssClass="pagination-ys" />
 </asp:GridView>
 <asp:SqlDataSource ID="MyDataSource" runat="server" ConnectionString="<%$ ConnectionStrings:DBCS %>"                     
 </asp:SqlDataSource>

让我感到困惑的是，当我进入调试模式时，strsql将返回

SELECT * FROM [MasterTbl]  
ORDER BY ItemID DESC

第一次点击时

但它实际上不会强制执行降序。然后在第二次点击时，它将返回

SELECT * FROM [MasterTbl]  
ORDER BY ItemID ASC

然后它按降序排序。

Answer 1

我已经复制了这个问题并尝试了许多方法来保持aggregate(CONC ~ ID + DRUG + FED, df, sum) # ID DRUG FED CONC #1 2 2 0 130 #2 1 1 1 60 DataSourceID="MyDataSource"的声明，同时保持MyGridView，但没有成功。

我能使其工作的唯一方法是从GridView的标记中删除DataSourceID属性并在代码隐藏中设置数据源：

public void BindMyGrid()
{        
    string sortExpression = this.ViewState["SortExpression"].ToString();
    string sortDirection = this.ViewState["SortDirection"].ToString();
    string strsql = "SELECT * FROM [MasterTbl]  ORDER BY " + sortExpression + " " + sortDirection + "";
    MyDataSource.SelectCommand = strsql;
    MyGridView.DataSource = MyDataSource;
    MyGridView.DataBind();
}

这就是我使用数据绑定控件的数据源的方式，我从来没有经历过问题中描述的奇怪行为。

ASP.NET Gridview不会在第一次单击时排序

1 个答案: