如何防止 LinqDataSourceWhere 子句在回发时重置？
我试图在单击按钮时以编程方式绑定到 GridView 的 LinqDataSource 对象上设置 where 子句，但是当 GridView 重新绑定数据时（例如，当用户排序时），Where 子句重置回空字符串。有没有办法防止这种情况，或者有更好的方法来过滤我的结果？
I'm trying to set the where clause on a LinqDataSource object bound to a GridView programmatically on a button click, but when the GridView rebinds data (for instance, when the user sorts) the Where clause resets back to the empty string. Is there a way to prevent this, or is there a better way to filter my results?
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也许您只是将 ViewState 属性添加到页面/用户控件中，然后在所有回发时检索它？
public string MyLinqSourceWhere { get { return (string)this.ViewState["MyLinqSourceWhere"]; } set { this.ViewState["MyLinqSourceWhere"] = value; } } public void Page_Load(object sender, EventArgs e) { this.myLinqSource.Where = this.MyLinqSourceWhere; } public void Button1_Click(object sender, EventArgs e) { this.MyLinqSourceWhere = " .... "; this.myLinqSource.Where = this.MyLinqSourceWhere; }如果这不起作用，那么也许可以在 LinqDataSource.Selecting 事件上绑定从视图状态到您的 where 子句的 fetch 属性？这一切都取决于
Perhaps you just add a ViewState property into your page/user control and then retrieve it on all post back?
public string MyLinqSourceWhere { get { return (string)this.ViewState["MyLinqSourceWhere"]; } set { this.ViewState["MyLinqSourceWhere"] = value; } } public void Page_Load(object sender, EventArgs e) { this.myLinqSource.Where = this.MyLinqSourceWhere; } public void Button1_Click(object sender, EventArgs e) { this.MyLinqSourceWhere = " .... "; this.myLinqSource.Where = this.MyLinqSourceWhere; }If that doesn't work, then perhaps bind on the LinqDataSource.Selecting event the fetch property from the viewstate to your where clause?? It all depends