Question

我已通过Microsoft WCF Web服务参考提供程序添加了连接服务（参见图片）代理类已成功创建。然后，当我尝试从这个Web服务执行sample方法（client.TestLanguageAsync() - 返回字符串）时，我得到null引用异常 - 但我不知道什么是null，因为异常的细节非常差（在图片上看）。下面是代码。

private async void BtnTest_Clicked(object sender, EventArgs e) {
    try {
        var endpoint = new EndpointAddress("https://f9512056.f95.ficosa.com/WMS/WMSWebService.asmx");
        BasicHttpBinding binding = new BasicHttpBinding(BasicHttpSecurityMode.Transport) {
            Name = "basicHttpBinding",
            MaxBufferSize = 2147483647,
            MaxReceivedMessageSize = 2147483647
        };
        TimeSpan timeout = new TimeSpan(0, 0, 30);
        binding.SendTimeout = timeout;
        binding.OpenTimeout = timeout;
        binding.ReceiveTimeout = timeout;
        WMSWebServiceSoapClient client = new WMSWebServiceSoapClient(binding, endpoint);
        string text = await client.TestLanguageAsync(); //This causes exception
        label.Text = text;
    } catch (Exception E) {
        label.Text = E.ToString();
    }
}

同样在屏幕上看

Adding service reference and exception screen

有什么想法吗？在此先感谢：）

在Xamarin Forms中调用Web服务时出错

0 个答案: