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我在通過ASP.NET C#傳遞iframe的src值時收到此錯誤。這裏isrc
是一個字符串變量:System.NullReferenceException:未將對象引用設置爲對象iframe的實例src
Line 26: HtmlControl ifm = (HtmlControl)this.FindControl("ifm");
Line 27: if (cover_id != null)
Line 28: ifm.Attributes["src"] = isrc;
Line 29: //Response.Redirect("Default2.aspx")
Line 30: }
\Default2.aspx.cs Line: 28
Source File: c:\Users\arsha\Documents\Visual Studio 2008\WebSites\hajcover\Default2.aspx.cs Line: 28
堆棧跟蹤:
[NullReferenceException: Object reference not set to an instance of an object.]
Default2.btn1_Click(Object sender, EventArgs e) in c:\Users\arsha\Documents\Visual Studio 2008\WebSites\hajcover\Default2.aspx.cs:28
System.Web.UI.WebControls.Button.OnClick(EventArgs e) +111
System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +110
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +36
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1565
Version Information: Microsoft .NET Framework Version:2.0.50727.4984; ASP.NET Version:2.0.50727.4971
你有一個ID爲'ifm'的控件嗎? – 2013-04-28 05:41:58
是的,我有一個iframe控件 – arsha 2013-04-28 05:47:09