c# - 结束方法中带有 "out"参数的 Task.Factory.FromAsync

Question

如何将 Task.Factory.FromAsync 工厂用于通过“out”参数返回多个值的结束方法？

begin 方法具有以下签名:

public virtual System.IAsyncResult BeginGetCaseStatus(int CaseOID, int ClientOID, System.AsyncCallback @__Callback, object @__UserData)

结束方法是:

public virtual void EndGetCaseStatus(System.IAsyncResult @__AsyncResult, out DTGenericCode[] BasicStatus, out DTGenericCode[] ARStatus)

我可以一些如何使用:

public Task<?> GetCaseStatusAsync(int CaseOID, int ClientOID)
{
    return Task.Factory.FromAsync  (BeginGetCaseStatus(CaseOID, ClientOID, null, null), EndGetCaseStatus(?, ?));
}

Answer 1

没有适用于此的 FromAsync 重载。最好的选择可能是构建您自己的包装器:

public class ResultStatus
{
     public ResultStatus(DTGenericCode[] basicStatus, DTGenericCode[] arStatus)
     {
         this.BasicStatus = basicStatus;
         this.ARStatus = arStatus;
     }
     public DTGenericCode[] BasicStatus { get; private set; }
     public DTGenericCode[] ARStatus { get; private set; }
}

public Task<ResultStatus> GetCaseStatusAsync(int CaseOID, int ClientOID)
{
     var tcs = new TaskCompletionSource<ResultStatus>();
     theClass.BeginGetCaseStatus(CaseOID, ClientOID, iar =>
             {
                 DTGenericCode[] bs;
                 DTGenericCode[] as;
                 theClass.EndGetCaseStatus(iar, out bs, out as);

                 tcs.SetResult(new ResultStatus(bs, as));
             }, null);

     return tcs.Task;
}