c# - 无法通过 fiddler 发布新记录

Question

我现在在通过 fiddler 发布记录时遇到了问题。我的代码如下:

[HttpPost]
public void AddStudent(Student s)
{
    SqlConnection myConnection = new SqlConnection();
    myConnection.ConnectionString = @"Data Source=PALLAVI-PC\SQLEXPRESS;Initial Catalog=StudentDB;Integrated Security=True;MultipleActiveResultSets=True;";

    SqlCommand sqlCmd = new SqlCommand();
    sqlCmd.CommandType = CommandType.Text;
    sqlCmd.CommandText = "INSERT INTO Tbl_Students (Roll_Number,FirstName,LastName,Class,Gender) Values (@Roll_Number,@FirstName,@LastName,@Class,@Gender)";
    sqlCmd.Connection = myConnection;

    sqlCmd.Parameters.AddWithValue("@Roll_Number", s.Roll_Number);
    sqlCmd.Parameters.AddWithValue("@FirstName", s.FirstName);
    sqlCmd.Parameters.AddWithValue("@LastName", s.LastName);
    sqlCmd.Parameters.AddWithValue("@Class", s.Class);
    sqlCmd.Parameters.AddWithValue("@Gender", s.Gender);

    myConnection.Open();
    int rowInserted = sqlCmd.ExecuteNonQuery();
    myConnection.Close();
}

当我在 fiddler 上运行它时，我得到一个 NullException。代码不排除响应主体。响应正文为 JSON 格式。图片如下:

编辑这是我遇到的错误(图片)。

Answer 1

我也会在 Fiddler 中设置 Content-Type header

内容类型:application/json