Question

我的MouseMove方法

package com.sa.asd.ax

public class VideoProvider {

    String DOWNLOAD_URL;
    public static List<MediaInfo> buildMedia(String url) throws JSONException {

        if (null != mediaList) {
            return mediaList;
        }
        Map<String, String> urlPrefixMap = new HashMap<>();
        mediaList = new ArrayList<MediaInfo>();
        String VIDEO_URL = null;
        String mimeType = null;
         for (int k = 0; k < videoSpecs.length(); k++) {
            JSONObject videoSpec = videoSpecs.getJSONObject(k);
              if(TARGET_FORMAT.equals(videoSpec.getString(TAG_VIDEO_TYPE))){
                    String youtubeLink = urlPrefixMap.get(TARGET_FORMAT) + videoSpec.getString(TAG_VIDEO_URL);
                    YouTubeUriExtractor ytEx = new YouTubeUriExtractor(null{
                     @Override
                    public void onUrisAvailable(String videoId, String videoTitle, SparseArray<YtFile> ytFiles) {
                    if(ytFiles!=null){
                        int itag = 22; // a YouTube format identifier
                        DOWNLOAD_URL = ytFiles.get(itag).getUrl();
                                     }
                }
        };

    ytEx.execute(youtubeLink);
    VIDEO_URL = DOWNLOAD_URL;
    mimeType = videoSpec.getString(TAG_VIDEO_MIME);
    mediaList.add(buildMediaInfo(VIDEO_URL, mimeType));           
                            }
                        }

        return mediaList;
    }


}

和我的拖拉方法

 var de = DragDropEffects.Copy;
 var df = DataFormats.Text;

 string[] dragObject = new string[] {
 "#Name#",
   _dragStartHitInfo.Node.GetValue("TextDisplay").ToString()
  };

 data.SetData(df, dragObject);

 treeList.DoDragDrop(data, de);

但是，我得到数据的空值。每次我删除对象时，如何正确设置对象类型

Answer 1

如果您只想要删除的文本，请使用

var data = e.Data.GetData(DataFormats.Text) as string;

Answer 2

也可以使用

处理

var baseObj = (System.Windows.Forms.DataObject)e.Data; 
string sFormat = baseObj.GetFormats();
var data = baseObj.GetData("System.String");

var getInnerData = data as System.String[];

转换字符串拖放对象

2 个答案: