遍历寻找json中的重复数据

string str = "[{\"ID\":1,\"Data\":{\"subjectCode\":\"1\",\"subjectName\":\"1\",\"subjectType\":\"1\",\"componentFormat\":\"2\"}},{\"ID\":2,\"Data\":{\"subjectCode\":\"1\",\"subjectName\":\"2\",\"subjectType\":\"1\",\"componentFormat\":\"2\"}},{\"ID\":4,\"Data\":{\"subjectCode\":\"1\",\"subjectName\":\"1\",\"subjectType\":\"1\",\"componentFormat\":\"2\"}}]";
JavaScriptSerializer jss = new JavaScriptSerializer();
List<A> aList = jss.Deserialize<List<A>>(str);
for (int i = 0; i < aList.Count - 1; i++)
{
int index = i + 1;
A a = aList[i];
while (index < aList.Count)
{
A b = aList[index];
if (a.Data.subjectCode.Equals(b.Data.subjectCode) && a.Data.subjectName.Equals(b.Data.subjectName) && a.Data.subjectType.Equals(b.Data.subjectType) && a.Data.componentFormat.Equals(b.Data.componentFormat))
{
string message = a.ID + "=" + b.ID;
Console.WriteLine(message);
break;
}
index++;
}
}
Console.ReadKey();
} public class A
{
public int ID { get; set; }
public B Data { get; set; }
} public class B
{
public string subjectCode { get; set; }
public string subjectName { get; set; }
public string subjectType { get; set; }
public string componentFormat { get; set; }
}