[英]RegisterForEventValidation can only be called during render() and Unable to evaluate expression because the code is optimized
[英]RegisterForEventValidation can only be called during Render
我有一個網絡方法,將從 jquery ajax 調用:
[WebMethod]
public string TestMethod(string param1, string param2)
{
StringBuilder b = new StringBuilder();
HtmlTextWriter h = new HtmlTextWriter(new StringWriter(b));
this.LoadControl("~/Pages/Controls/Listing.ascx").RenderControl(h);
string controlAsString = b.ToString();
return controlAsString;
}
(這是一個非靜態方法,我們能夠命中它。這不是問題)
當執行 loadControl() 方法時,我收到一條錯誤消息:RegisterForEventValidation can only be called during Render。
我已經為當前的 aspx 添加了 EnableEventValidation="false",還禁用了視圖狀態。 但我仍然得到同樣的錯誤。 對此有什么想法嗎?
解決方案是禁用Page的事件驗證
<%@ Page ............ EnableEventValidation="false" %>
並通過在C#代碼后面添加以下方法來覆蓋VerifyRenderingInServerForm
public override void VerifyRenderingInServerForm(Control control)
{
/* Confirms that an HtmlForm control is rendered for the specified ASP.NET
server control at run time. */
}
請參閱下面的鏈接
http://www.codeproject.com/Questions/45450/RegisterForEventValidation-can-only-be-called-duri
根據Brian的第二個鏈接,沒有進一步跳躍,只需這樣做:
StringBuilder sb = new StringBuilder();
StringWriter sw = new StringWriter(sb);
Html32TextWriter hw = new Html32TextWriter(sw);
Page page = new Page();
HtmlForm f = new HtmlForm();
page.Controls.Add(f);
f.Controls.Add(ctrl);
// ctrl.RenderControl(hw);
// above line will raise "RegisterForEventValidation can only be called during Render();"
HttpContext.Current.Server.Execute(page, sw, true);
Response.Write(sb);
您需要通過將EnableEventValidation
標志設置為false
來通知 ASP.Net 不要驗證該事件。
您可以通過以下方式在 Web.Config 中進行設置
<%@ Page Language="C#" AutoEventWireup="true" EnableEventValidation = "false"
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