将html表拖放到另一个应用程序中

Question

将html表拖放到另一个应用程序中

Joh*_*Con 4 html c# drag-and-drop winforms

我在将一个html表从我的C#winforms应用程序拖到外部应用程序(Outlook电子邮件消息)并将其呈现为表而不是该表的纯文本版本时遇到问题.我知道当你在剪贴板中复制/粘贴时,你必须把表放在CF_HTML格式中,但这似乎没有帮助拖动表.有谁知道我错过了什么？

Answer 1

Gra*_*ian 7

ObjectListView支持将行从ListView复制和拖动到文本和HTML版本的其他应用程序.为此,它执行以下操作:

DataObject dataObject = new DataObject();
this.CreateTextFormats(dataObject);
Clipboard.SetDataObject(dataObject);

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要进行拖放操作,代码几乎相同:

DataObject dataObject = new DataObject();
this.CreateTextFormats(dataObject);
DragDropEffects effect = this.DoDragDrop(dataObject, DragDropEffects.All);

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CreateTextFormats()并不复杂:

public void CreateTextFormats(DataObject do) {
    string textVersion;
    string htmlVersion;
    // Do the work of making the tab-separated text version and the HTML code
    do.SetData(textVersion);
    do.SetText(ConvertToHtmlFragment(htmlVersion), TextDataFormat.Html);
}

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正确获取HTML格式需要更长的时间:

/// <summary>
/// Convert the fragment of HTML into the Clipboards HTML format.
/// </summary>
/// <remarks>The HTML format is found here http://msdn2.microsoft.com/en-us/library/aa767917.aspx
/// </remarks>
/// <param name="fragment">The HTML to put onto the clipboard. It must be valid HTML!</param>
/// <returns>A string that can be put onto the clipboard and will be recognized as HTML</returns>
private string ConvertToHtmlFragment(string fragment) {
    // Minimal implementation of HTML clipboard format
    string source = "http://www.codeproject.com/KB/list/ObjectListView.aspx";

    const String MARKER_BLOCK =
        "Version:1.0\r\n" +
        "StartHTML:{0,8}\r\n" +
        "EndHTML:{1,8}\r\n" +
        "StartFragment:{2,8}\r\n" +
        "EndFragment:{3,8}\r\n" +
        "StartSelection:{2,8}\r\n" +
        "EndSelection:{3,8}\r\n" +
        "SourceURL:{4}\r\n" +
        "{5}";

    int prefixLength = String.Format(MARKER_BLOCK, 0, 0, 0, 0, source, "").Length;

    const String DEFAULT_HTML_BODY =
        "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\">" +
        "<HTML><HEAD></HEAD><BODY><!--StartFragment-->{0}<!--EndFragment--></BODY></HTML>";

    string html = String.Format(DEFAULT_HTML_BODY, fragment);
    int startFragment = prefixLength + html.IndexOf(fragment);
    int endFragment = startFragment + fragment.Length;

    return String.Format(MARKER_BLOCK, prefixLength, prefixLength + html.Length, startFragment, endFragment, source, html);
}

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好例子!但有一个补充:正确复制特殊字符(例如ÄÖÜäöüß),我在ConvertToHtmlFragment函数的开头添加了这一行:fragment = Encoding.Default.GetString(Encoding.UTF8.GetBytes(fragment) ); (摘自:http://msdn.microsoft.com/en-us/library/windows/desktop/ms649015(v = vs.85).aspx) (2认同)

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