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我有以下问题。我遇到了有关默认参数的错误。我为重载添加了一段简单的代码。现在我进入新代码（第 3 行：CreatePageSection(sItemID, "", null);) 给出了标题中提到的错误。

我在其他主题中寻找答案，但我找不到问题。有人能帮我吗？

代码可以在这里找到：

public void CreatePageSection(ref string sItemID)
    {
        CreatePageSection(sItemID, "", null);
    }

public void CreatePageSection(ref string sItemID, ref string sFrameUrl, ref object vOnReadyState)
    {

        if (Strings.InStr(msPresentPageSections, "|" + sItemID + "|", 0) > 0) {
            return;
        }
        msPresentPageSections = msPresentPageSections + sItemID + "|";

        string writeHtml = "<div class=" + MConstants.QUOTE + "PageSection" + MConstants.QUOTE + " id=" + MConstants.QUOTE + "Section" + sItemID + "Div" + MConstants.QUOTE + " style=" + MConstants.QUOTE + "display: none;" + MConstants.QUOTE + ">";
        this.WriteLine_Renamed(ref writeHtml);
        //UPGRADE_WARNING: Couldn't resolve default property of object vOnReadyState. Click for more: 'ms-help://MS.VSCC.v90/dv_commoner/local/redirect.htm?keyword="6A50421D-15FE-4896-8A1B-2EC21E9037B2"'
        //UPGRADE_NOTE: IsMissing() was changed to IsNothing_Renamed(). Click for more: 'ms-help://MS.VSCC.v90/dv_commoner/local/redirect.htm?keyword="8AE1CB93-37AB-439A-A4FF-BE3B6760BB23"'
        writeHtml = "  <iframe id=" + MConstants.QUOTE + sItemID + "Frame" + MConstants.QUOTE + " name=" + MConstants.QUOTE + sItemID + "Frame" + MConstants.QUOTE + " frameborder=" + MConstants.QUOTE + "0" + MConstants.QUOTE + (!string.IsNullOrEmpty(sFrameUrl) ? " src=" + MConstants.QUOTE + sFrameUrl + MConstants.QUOTE : "") + ((vOnReadyState == null) ? "" : " onreadystatechange=" + MConstants.QUOTE + Convert.ToString(vOnReadyState) + MConstants.QUOTE) + ">";
        this.WriteLine_Renamed(ref writeHtml);
        writeHtml = "  </iframe>";
        this.WriteLine_Renamed(ref writeHtml);
        writeHtml = "</div>";
        this.WriteLine_Renamed(ref writeHtml);

    }
4

2 回答 2

2

你必须通过引用传递参数

public void CreatePageSection(ref string sItemID)
{
    var missingString = String.Empty;
    object missingObject = null;
    CreatePageSection(ref sItemID, ref missingString, ref  missingObject);
}
于 2012-06-07T06:42:29.373 回答
0

由于您没有操作sFrameUrland ，请从这些参数vOnReadyState中删除关键字。ref

请参阅：http: //msdn.microsoft.com/en-us/library/14akc2c7 (v=vs.71).aspx

hth

马里奥

于 2012-06-07T06:35:39.157 回答