// 取出字符串中的数字
                                string img="{"treeId":11498,"treeName":"冲绳","imgId":11424,"imgName":"冲绳"}";
                               string regex = @"(\d+)";
                                System.Text.RegularExpressions.Match mstr = Regex.Match(img,regex);
                                string imgId = mstr.Groups[1].Value.ToString();