导致在WCF中返回HTTP错误状态

public void MyServiceMethod()
{
    // 抛出FaultException异常
    throw new FaultException<string>("Error message");
}

public void MyServiceMethod()
{
    // 获取WebOperationContext实例
    var context = WebOperationContext.Current;

    // 设置HTTP错误状态
    context.OutgoingResponse.StatusCode = HttpStatusCode.BadRequest;
    context.OutgoingResponse.StatusDescription = "Error message";
}

public HttpResponseMessage MyServiceMethod()
{
    // 创建HttpResponseMessage实例
    var response = new HttpResponseMessage(HttpStatusCode.BadRequest);

    // 设置错误消息
    response.Content = new StringContent("Error message");

    return response;
}