Question

req.Headers.Add("APP_TYPE", "IOSAPP");

我正在开发一个Xamarin表单应用程序，并希望从我的webapi获取数据。当我输入request.Headers.Add时，我在添加此消息时出现了一条波浪线

“/ Users / etgmacmini3 / Projects / sample1 / sample1 / GlobalClass.cs（16,16）：错误CS1061：'WebHeaderCollection'不包含'Add'的定义，也没有扩展方法'Add'接受第一个参数可以找到'WebHeaderCollection'类型（您是否缺少using指令或汇编引用？）（CS1061）（sample1）“

Answer 1

不确定“req”对象的类型是什么，但是如果你遵循这个，它应该让你开始向Web API发送HTTP请求：

using System.Net;
using System.Net.Http;

var httpClient = new HttpClient();
var data = "Some JSON data to be sent in your request body"; //May not need this, based on your app needs
var contentType = "application/json"; //May vary based on your app
var httpMethod = HttpMethod.Post; //or Get, or whatever HTTP verb your API endpoint needs

var request = new HttpRequestMessage()
{
    RequestUri = new Uri("http://YourWebApiUrlHere"),
    Method = httpMethod,  
    Content = new StringContent(data, System.Text.Encoding.UTF8, contentType) 
};
request.Headers.Add("YourHeaderName", "YourHeaderValue");

var httpResponse = await httpClient.SendAsync(request);

if (httpResponse.StatusCode == HttpStatusCode.OK)
{
    //It worked, so do something
}
else
{
    //It didn't work, so do something else
}

如何在xamarin

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