//js代码 
          var d = {
          Id: "1",
          Name: "name",
          Value: "OldValue", 7         };
        $.ajax({
          type: "post",
          url: url1,
          data: JSON.stringify({
            pConfig: d
          }),
          success:function(d){
          }
        });

public class Diff
  {
    public string Id { set; get; }
    public string Name { set; get; }
    public string Value { set; get; }
  }
 public Diff post([FromBody]Diff pConfig)
    {
      List<DiffConfig> s = pConfig;
      return s;
    }

//js代码 
         var d = [{
           Id: "1",
           Name: "name",
           Value: "Value",
         },{
           Id: "2",
           Name: "name2",
           Value: "Value2",
         }];
         $.ajax({
          type: "post",
          url: url1,
           data: JSON.stringify({
             pConfig: d
          }),
           success:function(d){
         }
        });

public List<Diff> post([FromBody]List<Diff> diff)
     {
       List<Diff> d = diff;
       return d;
     }

$.ajax({
      type: "post",
      dataType: 'json',
      url: url,
      contentType: 'application/json',
      data: JSON.stringify(d),
      success: function (d) {
       
      }
    });