本文是小编为大家收集整理的关于Api丢失的参数的处理/解决方法，可以参考本文帮助大家快速定位并解决问题，中文翻译不准确的可切换到English标签页查看源文。
问题描述
嗨，我有这个代码来运行我的api方法
export class MessageService {
constructor(private http: Http) {
}
addMessage(textToSend: string) {
return this.http.post("/api/SendMessage", textToSend); //<- Everytime i have some text in textToSend and this is ok
}
}
和在我的API之后，我的param等于null
[HttpPost]
[Route("/api/SendMessage")]
public void SendMessage(string msg) //null value
{
//some code
}
推荐答案
可能的解决方案1:
addMessage(textToSend: string) {
let body = JSON.stringify({ textToSend });
let headers = new Headers({ 'Content-Type': 'application/json' });
let options = new RequestOptions({ headers: headers });
return this.http.post("/api/SendMessage/", body, options);
}
// Server side -1
[HttpPost]
[Route("/api/SendMessage")]
public void SendMessage([FromBody]IDictionary<string, string> msg)
{
var textToSend = msg["textToSend"];
}
// Or create a model and use it
//Server side -2
public class Model
{
public string textToSend { get; set; }
}
public void SendMessage([FromBody]Model model)
可能的解决方案2:
addMessage(textToSend: string) {
return this.http.post("/api/SendMessage/" + textToSend);
}
[HttpPost]
[Route("/api/SendMessage/textToSend")]
public void SendMessage(string textToSend)
{
//some code
}
其他推荐答案
您的控制器操作是接受查询参数，而不是路由器参数或模型.
如果要接受路由参数，则需要将其添加到路由中.
如果要在正文中传递模型或值，则必须使用[FromBody]属性标记参数.
[HttpPost]
[Route("/api/SendMessage")]
public void SendMessage([FromBody]string msg)
{
MessageBox MsgBox = new MessageBox();
MsgBox.AddMsgToMsgBox(msg);
}
如果您没有定义任何内容，则控制器期望参数传递为查询/api/SendMessage?msg=someMessage(您在休息服务中不应该做，因为它不是很"RESTful"
其他推荐答案
尝试
addMessage(textToSend: string) {
return this.http.post("/api/SendMessage", msg); //<- Everytime i have some text in textToSend and this is ok
}
更改了变量的名称以匹配您在控制器中的期望
中的一个问题描述
Hi I have this code to run my api method
export class MessageService {
constructor(private http: Http) {
}
addMessage(textToSend: string) {
return this.http.post("/api/SendMessage", textToSend); //<- Everytime i have some text in textToSend and this is ok
}
}
And after in my Api my param is equals to null
[HttpPost]
[Route("/api/SendMessage")]
public void SendMessage(string msg) //null value
{
//some code
}
推荐答案
Possible solution 1:
addMessage(textToSend: string) {
let body = JSON.stringify({ textToSend });
let headers = new Headers({ 'Content-Type': 'application/json' });
let options = new RequestOptions({ headers: headers });
return this.http.post("/api/SendMessage/", body, options);
}
// Server side -1
[HttpPost]
[Route("/api/SendMessage")]
public void SendMessage([FromBody]IDictionary<string, string> msg)
{
var textToSend = msg["textToSend"];
}
// Or create a model and use it
//Server side -2
public class Model
{
public string textToSend { get; set; }
}
public void SendMessage([FromBody]Model model)
Possible solution 2:
addMessage(textToSend: string) {
return this.http.post("/api/SendMessage/" + textToSend);
}
[HttpPost]
[Route("/api/SendMessage/textToSend")]
public void SendMessage(string textToSend)
{
//some code
}
其他推荐答案
Your controller action is accepting a query parameter, not a router parameter or model.
If you want to accept a route parameter, you need to add it to the route.
If you want to pass a model or value in the body, you must mark the parameter with [FromBody] attribute.
[HttpPost]
[Route("/api/SendMessage")]
public void SendMessage([FromBody]string msg)
{
MessageBox MsgBox = new MessageBox();
MsgBox.AddMsgToMsgBox(msg);
}
If you don't define anything, the controller expects the parameter to be passed as query /api/SendMessage?msg=someMessage (which you shouldn't do in a REST service, as it's not very "RESTful"
其他推荐答案
try
addMessage(textToSend: string) {
return this.http.post("/api/SendMessage", msg); //<- Everytime i have some text in textToSend and this is ok
}
changed the name of the variable to match the one you are expecting in the controller
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