C# .NET SOAP不在请求头中发送基本身份验证

为了与SOAP Web服务通信，我使用了由SvcUtil.exe从wsdl文件创建的C#类

当将下面的请求发送到安全服务器（带有基本身份验证的HTTPS）时，我收到System.ServiceModel.Security.MessageSecurityException，当通过让流量通过Burp代理检查HTTP请求时，我看到没有传递基本身份验证信息。C#代码中是否缺少SOAP请求的任何内容，或者基本身份验证不起作用的问题是什么

var binding = new WSHttpBinding();
binding.MessageEncoding = WSMessageEncoding.Mtom;

binding.Security.Mode = SecurityMode.Transport;
binding.Security.Transport.ClientCredentialType = HttpClientCredentialType.Basic;
binding.Name = "BasicAuthSecured";

SearchServicePortClient searchClient = new SearchServicePortClient(binding,  new EndpointAddress("https://myUrl:Port/myService"));
searchClient.ClientCredentials.UserName.UserName = "username";
searchClient.ClientCredentials.UserName.Password = "pw";

query soap = new query();
//...

queryResponse response = searchClient.query(soap);

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提前感谢

尝试使用TransportWithMessageCredential:

binding.Security.Mode = SecurityMode.TransportWithMessageCredential;

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这是另一种方法，但不知道它是否是最好的

using (var client = _clientFactory.GetClient())
{
    var credentials = Utils.EncodeTo64("user123:password");
    client.ChannelFactory.CreateChannel();
    using (OperationContextScope scope = new OperationContextScope(client.InnerChannel))
    {
        var httpRequestProperty = new HttpRequestMessageProperty();
        httpRequestProperty.Headers[HttpRequestHeader.Authorization] = "Basic " + credentials;
        OperationContext.Current.OutgoingMessageProperties[HttpRequestMessageProperty.Name] = httpRequestProperty;
        //operation
        client.Send(request);
    }
}

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对不起，我不记得是3年前的事了。