SaveFileDialog OpenFileDialog的应用

string saveFileName;
            SaveFileDialog saveDialog = new SaveFileDialog();
            saveDialog.DefaultExt="pdf";
            saveDialog.Filter = "pdf文件|*.pdf";
            saveDialog.ShowDialog();
            saveFileName = saveDialog.FileName;
            if (saveFileName.IndexOf(":") < 0)  //被点了取消
                return;

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OpenFileDialog picDialog = new OpenFileDialog();
            picDialog.DefaultExt = "jpeg";
            picDialog.Filter = "jpg文件|*.jpg";
            //saveDialog.FileName = "";
            picDialog.ShowDialog();
            picFilePath = picDialog.FileName;　　//获得路径
            if (picFilePath.IndexOf(":") < 0)  //被点了取消
                return;