Drag and drop a html table into another application
I'm having a problem dragging an html table from my C# winforms application into an external application (Outlook email message) and getting it to render as a table instead of a plain text version of that table. I know that when you copy/paste in the clipboard you have to put the table in CF_HTML forma开发者_开发知识库t but that doesn't seem to help with dragging the table. Does anyone know what I am missing?
ObjectListView supports copying and dragging rows from a ListView to other applications, in both text and HTML versions. To do that, it does something like this:
DataObject dataObject = new DataObject();
this.CreateTextFormats(dataObject);
Clipboard.SetDataObject(dataObject);
To do drag and drop, the code is virtually the same:
DataObject dataObject = new DataObject();
this.CreateTextFormats(dataObject);
DragDropEffects effect = this.DoDragDrop(dataObject, DragDropEffects.All);
CreateTextFormats() is not complicated:
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);
}
Getting the HTML format right took longer:
/// <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);
}
If you don't need formatting, simply copy it to the clipboard as tab-delimited text. This way it'll paste as a table in Excel, and presumable most other table-compatible applications.
加载中,请稍侯......
精彩评论