c# - 在可重用类中封装多个服务引用操作

Question

我有一个 .NET 服务引用，我想将其封装到一个可重用的类中。

我典型的调用看起来像这样:

// instantiate the api and set credentials
ApiClient api = new ApiClient();
api.Credentials.UserName.UserName = "blah";
api.Credentials.UserName.Password = "blahblah";

// operation-specific search parameter object
SomethingSearch search = new SomethingSearch();
search.Key = "blah";

Result[] result = api.GetSomething(search);

api.Close();

其他调用在调用的操作和搜索参数对象上有所不同。

问题是，我不知道如何将 API 操作的名称(即 GetSomething() 和特定于操作的搜索对象 ( SomethingSearch))传递到类中。

我怎样才能做到这一点？我不是要求为我完成工作，但我不确定从哪里开始。我相信这与 Func<T> 有关和代表，但令人尴尬的是，我对他们缺乏经验。

Answer 1

我的一位同事开发了这个解决方案:

/// <summary>
/// Proxy for executing generic service methods
/// </summary>
public class ServiceProxy
{
    /// <summary>
    /// Execute service method and get return value
    /// </summary>
    /// <typeparam name="C">Type of service</typeparam>
    /// <typeparam name="T">Type of return value</typeparam>
    /// <param name="action">Delegate for implementing the service method</param>
    /// <returns>Object of type T</returns>
    public static T Execute<C, T>(Func<C, T> action) where C : class, ICommunicationObject, new()
    {
        C svc = null;

        T result = default(T);

        try
        {
            svc = new C();

            result = action.Invoke(svc);

            svc.Close();
        }
        catch (FaultException ex)
        {
            // Logging goes here
            // Service Name: svc.GetType().Name
            // Method Name: action.Method.Name
            // Duration: You could note the time before/after the service call and calculate the difference
            // Exception: ex.Reason.ToString()

            if (svc != null)
            {
                svc.Abort();
            }

            throw;
        }
        catch (Exception ex)
        {
            // Logging goes here

            if (svc != null)
            {
                svc.Abort();
            }

            throw;
        }

        return result;
    }
}

及其使用示例:

public class SecurityServiceProxy
{

    public static UserInformation GetUserInformation(Guid userId)
    {
        var result = ServiceProxy.Execute<MySecurityService, UserInformation>
        (
            svc => svc.GetUserInformation(userId)
        );

        return result;
    }

    public static bool IsUserAuthorized(UserCredentials creds, ActionInformation actionInfo)
    {
        var result = ServiceProxy.Execute<MySecurityService, bool>
        (
            svc => svc.IsUserAuthorized(creds, actionInfo)
        );

        return result;
    }
 }

在这个假案例中，我们使用了来自 MySecurityService 的两种方法, GetUserInformation和 IsUserAuthorized . GetUserInformation需要 Guid作为参数并返回 UserInformation目的。 IsUserAuthorized需要 UserCredentials和 ActionInformation对象，并返回一个 bool用户是否被授权。

此代理也是缓存可缓存服务调用结果的理想场所。

如果您需要向服务器发送参数，可能有更通用的方法，但我认为您需要为其创建一个特定的代理。示例:

public interface ISecuredService
{
   public UserCredentials Credentials { get; set; }
}

/// <summary>
/// Proxy for executing generic UserCredentials  secured service methods
/// </summary>
public class SecuredServiceProxy
{
    /// <summary>
    /// Execute service method and get return value
    /// </summary>
    /// <typeparam name="C">Type of service</typeparam>
    /// <typeparam name="T">Type of return value</typeparam>
    /// <param name="credentials">Service credentials</param>
    /// <param name="action">Delegate for implementing the service method</param>
    /// <returns>Object of type T</returns>
    public static T Execute<C, T>(UserCredentials credentials, Func<C, T> action) where C : class, ICommunicationObject, ISecuredService, new()
    {
        C svc = null;

        T result = default(T);

        try
        {
            svc = new C();
            svc.Credentials = credentials;

            result = action.Invoke(svc);

            svc.Close();
        }
        catch (FaultException ex)
        {
            // Logging goes here
            // Service Name: svc.GetType().Name
            // Method Name: action.Method.Name
            // Duration: You could note the time before/after the service call and calculate the difference
            // Exception: ex.Reason.ToString()

            if (svc != null)
            {
                svc.Abort();
            }

            throw;
        }
        catch (Exception ex)
        {
            // Logging goes here

            if (svc != null)
            {
                svc.Abort();
            }

            throw;
        }

        return result;
    }
}