NSMutableString到NSDictionary转换返回null [优先级]

Question

NSMutableString * strSocketResponse = [[NSMutableString alloc]init];

 strSocketResponse = //Append socket response from server which is valid JSON string
//This response is without escaping character '\'

 NSString *jsonString = @"{\"ID\":{\"Content\":268,\"type\":\"text\"},\"ContractTemplateID\":{\"Content\":65,\"type\":\"text\"}}";

 NSDictionary *dictValues1 = [[NSDictionary alloc] init];
 NSDictionary *dictValues2 = [[NSDictionary alloc] init];

 NSData* data1 = [strSocketResponse dataUsingEncoding:NSUTF8StringEncoding];
 NSData* data2 = [jsonString dataUsingEncoding:NSUTF8StringEncoding];

 NSError *error;

 dictValues1 = [NSJSONSerialization JSONObjectWithData:data1 options:kNilOptions error:&error];

 dictValues2 = [NSJSONSerialization JSONObjectWithData:data2 options:kNilOptions error:&error];

 NSLog("dictValues1 : %@", [dictValues1 description]);
 NSLog("dictValues2 : %@", [dictValues2 description]);

strSocketResponse的NSLog值：

       {
    "data": {
        "elapsed": "0.171s",
        "size": "10",               
         ...
        "items": [
            {
                "code": "29688",
                "length": "17",
                ...
             }, 
            {   ...
             }
          ]
      }
   }

dictValues1的日志始终为空，而dictValues2的日志是正确的。我发现两者之间唯一的区别是 dictValues1的转换字符串是NSMutableString而没有转义字符＆＃39; 。无法添加转义字符＆＃39; \＆＃39;在字符串中，因为它太长了。

我该如何处理这个问题？肯定+1正确答案!!