替换数据框中特定列中的唯一值(Replace unique values in specific columns in a dataframe)

 在listview的DragEnter事件中，返回以下DragDropEffects ： 
 
private void listView_DragEnter(object sender, DragEventArgs e)
{
    e.Effect = DragDropEffects.All;
}
 
 要在DragDrop事件中提取和读取Outlook消息，我建议使用此库。 这是非常容易使用： 
 
private void listView_DragDrop(object sender, DragEventArgs e)
{
    OutlookDataObject dataObject = new OutlookDataObject(e.Data);

    //get the names and data streams of the files dropped
    string[] filenames = (string[])dataObject.GetData("FileGroupDescriptor");
    MemoryStream[] filestreams = (MemoryStream[])dataObject.GetData("FileContents");

    for (int fileIndex = 0; fileIndex < filenames.Length; fileIndex++)
    {
        string filename = filenames[fileIndex];
        MemoryStream filestream = filestreams[fileIndex];

        OutlookStorage.Message message = new OutlookStorage.Message(filestream);

        // do whatever you want with "message"

        message.Dispose();
    }
}

In the listview's DragEnter Event, return the following DragDropEffects:
 
private void listView_DragEnter(object sender, DragEventArgs e)
{
    e.Effect = DragDropEffects.All;
}
 
To extract and read the Outlook message(s) within the DragDrop event, I recommend using this library. It is very easy to use:
 
private void listView_DragDrop(object sender, DragEventArgs e)
{
    OutlookDataObject dataObject = new OutlookDataObject(e.Data);

    //get the names and data streams of the files dropped
    string[] filenames = (string[])dataObject.GetData("FileGroupDescriptor");
    MemoryStream[] filestreams = (MemoryStream[])dataObject.GetData("FileContents");

    for (int fileIndex = 0; fileIndex < filenames.Length; fileIndex++)
    {
        string filename = filenames[fileIndex];
        MemoryStream filestream = filestreams[fileIndex];

        OutlookStorage.Message message = new OutlookStorage.Message(filestream);

        // do whatever you want with "message"

        message.Dispose();
    }
}