单击按钮更改LinqDataSource

时间:2012-10-31 07:41:07

标签: c# asp.net .net asp.net-mvc c#-4.0

我的asp页面上有一个GridView。我想通过单击按钮来更改LinqDataSource。这是因为我有2个数据库视图,您必须能够根据需要查看其中一个视图。当我尝试将GridView绑定到我的任何LinqDataSource时,我的问题没有发生。

我的C#代码:

protected void Page_Load(object sender, EventArgs e)
{
    this.Grid.DataSource = lqds_Grid1;
    this.Grid.DataBind();
}

protected void Button1_Click(object sender, EventArgs e)
{
    if (this.Grid.DataSource == lqds_Grid1)
    {
        this.Grid.DataSource = lqds_Grid2;
        this.Grid.DataBind();
    }
    else
    {
        this.Grid.DataSource = lqds_Grid1;
        this.Grid.DataBind();
    }
}

我的asp代码:

<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true"
    CodeBehind="Default.aspx.cs" Inherits="AddressReporting._Default" %>

<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">
</asp:Content>
<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
    <asp:LinqDataSource ID="lqds_Grid1" runat="server" 
        ContextTypeName="AddressReporting.MobileGateway" EntityTypeName="" 
        OrderBy="AdrID, Country" TableName="BarcodeWithLocation">
    </asp:LinqDataSource>
    <asp:LinqDataSource ID="lqds_Grid2" runat="server" 
        ContextTypeName="AddressReporting.MobileGateway" EntityTypeName="" 
        OrderBy="AdrID, Country" TableName="BarcodeWithLocationSorted">
    </asp:LinqDataSource>
    <asp:GridView ID="Grid" runat="server" AllowPaging="True" 
        AutoGenerateColumns="False" Height="217px" Width="268px">
</asp:GridView>
    <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />
</asp:Content>

2 个答案:

答案 0 :(得分:1)

这是因为page_load方法(事件)工作时间页面加载所以它不是那么正确

protected void Page_Load(object sender, EventArgs e)
{
  if(!isPostBack) {
       this.Grid.DataSource = lqds_Grid1;
       this.Grid.DataBind();
   }
}

你应该检查页面是否有回发

答案 1 :(得分:0)

首先,您可以尝试将数据源设置为null,然后再为其赋予新值,并在分配新值后,您可以调用datagrid的refresh方法以强制它重绘自己

this.Grid.DataSource = null;
this.Grid.DataSource = lqds_Grid1;
this.Grid.DataBind();
this.Grid.DataSource.Refresh();