[英]Model binding in ASP.NET Core API are always null
I have a simple ASP.NET Core API which I invoke with javascript's fetch method.我有一个简单的 ASP.NET Core API,我使用 javascript 的 fetch 方法调用它。 But the input variable model of type SearchString property is always null.
但是SearchString属性类型的输入变量模型始终为空。
It works as expected when I invoke it using Postman, but not from javascript, for some reason.出于某种原因,当我使用 Postman 调用它时,它按预期工作,但不能从 javascript 调用。
API :应用程序接口:
[HttpPost]
public async Task<IActionResult> Search([FromBody] BasicSearchModel model)
{
....
}
BasicSearchModel.cs :基本搜索模型.cs :
public interface IBasicSearchModel
{
string SearchString { get; set; }
}
public class BasicSearchModel : IBasicSearchModel
{
public string SearchString { get; set; }
}
JavaScript : JavaScript :
const WebRequest = async (controller = "API", action, query = {}, data = {}, method = RequestMethods.POST, mode = RequestModes.SameOrigin, creds = RequestCredentials.SameOrigin, headers = {
"Content-Type": "application/json",
"Accept": "application/json"
}) => {
const GetUrl = () => {
var result = "/" + controller + "/" + action;
var i = 0;
for (var q in query) {
if (i === 0) {
result += "?";
} else {
result += "&";
}
result += q[0] + "=" + q[1];
i++;
}
return result;
}
await fetch(GetUrl(), {
method: method,
headers: headers,
// @ts-ignore
credentials: creds.toLowerCase(),
// @ts-ignore
body: data,
// @ts-ignore
mode: mode.toLowerCase(),
})
.then(response => {
if (response.ok) {
return new RequestResult(response);
} else {
throw new Error("Request failed: " + response.status + "; " + response.statusText);
}
})
.catch(error => {
throw new Error("Error: " + error.statusText);
});
};
JavaScript call : JavaScript 调用:
var result = await WebRequest("Identity", "Search", null, { SearchString: str });
Request :请求:
Headers : Accept: "application/json", "Content-Type": "application/json"标头:接受:“application/json”,“Content-Type”:“application/json”
Method : "POST"方法:“POST”
Body : SearchString: "tester"正文:SearchString在: “测试仪”
It works as expected when invoked using Postman most likely because it is in the correct format.它在使用 Postman 调用时按预期工作,很可能是因为它的格式正确。
SearchString: "tester"
搜索字符串:“测试员”
is not valid JSON不是有效的 JSON
Stringyfy the data to be sent将要发送的数据字符串化
await fetch(GetUrl(), {
method: method,
headers: headers,
// @ts-ignore
credentials: creds.toLowerCase(),
// @ts-ignore
body: JSON.stringify(data), //<--NOTE
// @ts-ignore
mode: mode.toLowerCase(),
})
so that it is in the correct format to be parsed by the model binder.以便模型绑定器解析正确的格式。
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