Question

我正在使用带有gridview控件的Hijri Gerogian Datapicker的许多实例，当我从gridview中删除时，会收到以下错误：

StartIndex cannot be less than zero.
Parameter name: startIndex

Line 173:                    //to manage multiple instances of user control postback, incase the postback happend due to culture changeed in current control,
Line 174:                    //the other user contrls culture drop down list to be changed accordingly. Also year and month dropdown lists according to culture 
Line 175:                    if (strPostBackControlName != "" && strPostBackControlName.Substring(strPostBackControlName.LastIndexOf("$")) == "$ddlLocaleChoice")
Line 176:                    {
Line 177:                        if (ddlLocaleChoice.SelectedValue == arabicCulture.Name)


[ArgumentOutOfRangeException: StartIndex cannot be less than zero.
Parameter name: startIndex]
   System.String.Substring(Int32 startIndex, Int32 length) +13011515
   System.String.Substring(Int32 startIndex) +15
   Hijri_Greg_DatePicker_Sample.HijriGregDatePicker.Page_Load(Object sender, EventArgs e) in C:\Users\Mawni\Desktop\Hijri_Greg_DatePicker_Sample\HijriGregDatePicker.ascx.cs:175
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +51
   System.Web.UI.Control.OnLoad(EventArgs e) +95
   System.Web.UI.Control.LoadRecursive() +59
   System.Web.UI.Control.LoadRecursive() +131
   System.Web.UI.Control.LoadRecursive() +131
   System.Web.UI.Control.LoadRecursive() +131
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +678

有帮助吗？

Answer 1

看看这段代码：

strPostBackControlName.LastIndexOf("$")

它将返回字符串中$的最后一个索引，但是当找不到$时，它将返回-1作为结果。稍后，您将尝试使用此结果调用strPostBackControlName.Substring，但是Substring具有以下原型：

public string Substring (int startIndex);

您当然不能使用起始索引小于0的名称来调用它（因为字符串中的索引从0开始）。添加检查以确保LastIndexOf("$")不是-1或确保strPostBackControlName始终包含$。

StartIndex不能小于零。参数名称：startIndex使用HijriDatePicker？

1 个答案: