自定义CheckBoxList WebControl错误

时间:2015-04-21 15:02:41

标签: c# asp.net custom-controls checkboxlist asp.net-webcontrol

我正在创建一个自定义的CheckBox WebControl,它继承了ASP.NET中的System.Web.UI.WebControls.CheckBox。但是在回发时收到此错误:

输入字符串的格式不正确。

[FormatException: Input string was not in a correct format.]
System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) +10896279
System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info) +145
System.Web.UI.WebControls.CheckBoxList.LoadPostData(String postDataKey, NameValueCollection postCollection) +140
System.Web.UI.WebControls.CheckBoxList.System.Web.UI.IPostBackDataHandler.LoadPostData(String postDataKey, NameValueCollection postCollection) +16
System.Web.UI.Page.ProcessPostData(NameValueCollection postData, Boolean fBeforeLoad) +734
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1960

我有一个名为ItemList的CheckBox列表和OnInit我执行此功能:

 internal void InitItems()
    {
        for (int i = 0; i < this.Items.Count; i++)
        {
            CheckBox cb = new CheckBox()
            {
                LabelPosition = CheckBox.LabelPositions.None
            };

            ItemList.Add(cb);
            Controls.Add(cb);
        }
    }

我将此方法称为OnRender:

public string RenderItems() { 

        StringBuilder sb = new StringBuilder();

        for (int i = 0; i < this.Items.Count; i++)
        {
            ListItem item = this.Items[i];
            CheckBox cb = ItemList[i];
            cb.Text = item.Text;
            cb.Enabled = Enabled ? item.Enabled : Enabled;
            cb.Checked = item.Selected;
            cb.ID =  i.ToString();
            cb.ViewType = (CheckBox.ViewTypes) Enum.Parse(typeof(CheckBox.ViewTypes),this.ViewType.ToString());
            cb.DisplayType = (CheckBox.DisplayTypes)Enum.Parse(typeof(CheckBox.DisplayTypes), this.DisplayType.ToString());
            if (this.AutoPostBack)
                cb.Attributes.Add("onclick", "javascript:setTimeout('__doPostBack(\\'" + cb.ClientName + "\\',\\'\\')', 0)");

            sb.Append(cb.GetHtml());
        }

        return sb.ToString();
    }

我想我收到此错误,因为生成的复选框有一个错误的ID或名称。有什么建议吗?

1 个答案:

答案 0 :(得分:0)

我想到的唯一可能的原因是这一行:

cb.Attributes.Add("onclick", "javascript:setTimeout('__doPostBack(\\'" + cb.ClientName + "\\',\\'\\')', 0)");

您不需要那些\\

cb.Attributes.Add("onclick", "javascript:setTimeout('__doPostBack('" + cb.ClientName + "','')', 0)");