Question

我有一个简单的Xamarin.Forms页面，其中包含WebView，运行良好。现在我想为URL调用POST-Requests（发送表单数据）。我是否必须为Android，iOS和UWP创建3个不同的视图才能实现这一点 - 或者是否有办法在我的Xamarin-Forms项目的共享编码中只实现一次C＃post-request代码？

Answer 1

正如@ hvaughan3所说，你可以像这样使用HttpClient（来自你的Xamarin Forms项目的共享代码）：

private static HttpClient client = new HttpClient() { Timeout = TimeSpan.FromSeconds(30) };

HttpContent content = new StringContent(JsonConvert.SerializeObject(objectToPost), Encoding.UTF8, "application/x-www-form-urlencoded");

var response = await client.PostAsync(new Uri("http://your.url"), content);

if (response.IsSuccessStatusCode) {
    var responseFromServer = await response.Content.ReadAsStringAsync();
}
else {
    // handle errors
}

Answer 2

使用HTTPcLient进行form-URLencoded post请求，然后创建自定义Webview来处理cookie。使用由seansparkman创建的CookieWebView Nuget包。

请检查https://www.nuget.org/packages/CookieWebView/

Answer 3

通过网络视图发布请求 对于WkWebview

[assembly: ExportRenderer(typeof(PaymentWebview), typeof(PaymentWebViewRenderer))]
namespace MMFInvestorApp.iOS.Utils
{
    public class PaymentWebViewRenderer : WkWebViewRenderer
    {
        protected override void OnElementChanged(VisualElementChangedEventArgs e)
        {
            base.OnElementChanged(e);

            if (NativeView != null)
            {
                var request = new NSMutableUrlRequest(new NSUrl(new NSString(paymentwebview.url))); //Your Url
                request.HttpMethod = "POST";
                request.Body = NSData.FromString(paymentwebview.data); //Data for POST
                request["Content-Length"] = req.Body.Length.ToString();
                request["Content-Type"] = "application/x-www-form-urlencoded charset=utf-8";
                LoadRequest(request);
            }

        }


    }
}

用于UIWebview（自2020年4月起废弃

[assembly: ExportRenderer(typeof(PaymentWebview), typeof(PaymentWebViewRenderer))]
namespace MMFInvestorApp.iOS.Utils
{
    public class PaymentWebViewRenderer : WebViewRenderer
    {
        protected override void OnElementChanged(VisualElementChangedEventArgs e)
        {
            base.OnElementChanged(e);

            if (NativeView != null)
            {
                var paymentwebview = Element as PaymentWebview;
                var request = new NSMutableUrlRequest(new NSUrl(new NSString(paymentwebview.url)));//Your Url
                request.Body = paymentwebview.data; //Data for POST
                request.HttpMethod = "POST";
                LoadRequest(request);
            }

        }


    }
}

Xamarin WebView中的POST请求？

3 个答案: