.Net5的WebApi中的Post请求，FromBody和FromForm

• • FromBody特性的使用(推荐使用)：只能接收单个对象(实体对象或动态类型(dynamic))作参数，无法绑定简单类型(int、string、decimal等)的参数
  • FromForm特性的使用：接口参数为实体对象或或简单类型参数

1. 客户端Content-Type是application/json时，接口参数加[FromBody]能正常解析到参数(接口参数为实体对象或动态类型(dynamic)都能解析到参数)
2. 客户端Content-Type是application/x-www-formencoded时，接口参数加或不加[FromBody]，接口报415 Unsupported Media Type
3. 客户端Content-Type是multipart/form-data时，接口参数加或不加[FromBody]，接口报400 Bad Request

前端代码：

	var into = JSON.stringify({ Id: 123, Name: "zsls" });
	console.log(into);
	$.ajax({
	    url: "http://localhost:51882/Test/SetParams",
	    data: into,
	    type: "post",
	    //application/x-www-formencoded、multipart/form-data、application/json
	    contentType: "application/json",
	    dataType: "json",
	    success: function (res) {
	        console.log("success===============" + res);
	    },
	    error: function (xhr, textStatus, errorThrown) {
	        console.log("error===============" + xhr.responseText);
	    }
	});

后端代码：

	/// 

	/// 学生信息
	/// 
	public class Student
	{
	    /// 

	    /// 学生Id
	    /// 
	    public int Id { get; set; }
	    /// 

	    /// 学生姓名
	    /// 
	    public string Name { get; set; }
	}
	
	
	[HttpPost]
	public IActionResult SetParams([FromBody] Student stu)
	{
	    return Content("OK");
	}
	
	[HttpPost]
	public IActionResult SetParams1([FromForm] dynamic obj)
	{
	    return Content("OK");
	}

1. 客户端Content-Type是multipart/form-data时(ajax指定contentType为false，axios指定Content-Type为multipart/form-data)，以FormData格式提交数据接口参数加[FromForm]能正常解析到参数(接口参数为实体对象或或简单类型参数都能解析到参数)

前端代码：

	var formData = new FormData();
	formData.append("id", 12);
	formData.append("name", "fls");
	$.ajax({
	    url: "http://localhost:51882/Test/SetParams",
	    data: formData,
	    type: "post",
	    processData: false,
	    contentType: false,
	    dataType: "json",
	    success: function (res) {
	        console.log("success===============" + res);
	    },
	    error: function (xhr, textStatus, errorThrown) {
	        console.log("error===============" + xhr.responseText);
	    }
	});

后端代码：

	/// 

	/// 学生信息
	/// 
	public class Student
	{
	    /// 

	    /// 学生Id
	    /// 
	    public int Id { get; set; }
	    /// 

	    /// 学生姓名
	    /// 
	    public string Name { get; set; }
	}
	
    [HttpPost]
    public IActionResult SetParams([FromForm] int id, [FromForm] string name)
    {
        return Content($"OK,{id},{name}");
    }

    [HttpPost]
    public IActionResult SetParams1([FromForm] Student stu)
    {
        return Content("OK");
    }