解決方案

1、在Model的相關(guān)屬性上設(shè)置 [DisplayFormat(ConvertEmptyStringToNull = false)]

[DisplayFormat(ConvertEmptyStringToNull = false)]
public string id{ get; set; }

2、設(shè)置請求contentType為 application/json；

 $.ajax({
      type: "POST",
      url: "#",
      data:data,
      dataType: "json",
      contentType:"application/json;charset=utf-8",
      success: function(data){
        //do somthing...
      }
    });