C# _请求在问题中，此行可能是removed@IronMan84,这是要在数据库中搜索的值，用于查找普通客户并将其放入要删除的列表中。您可以在第一行使用AsEnumerable而不是ToList，以确保在客户端执行第二次Select，而不必强制将整个查询拉入内

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_请求在问题中，此行可能是removed@IronMan84,这是要在数据库中搜索的值，用于查找普通客户并将其放入要删除的列表中。您可以在第一行使用

AsEnumerable

而不是

ToList

，以确保在客户端执行第二次

Select

，而不必强制将整个查询拉入内存，也不必执行任何操作创建一个从未使用过的列表。cancelRequest执行删除操作。我不必为此手动编写代码。它是一个自动生成的对象。@GrantThomas可能是取消请求的集合通过其他方法发送到服务器。问题很简单，OP唯一不知道如何做的就是创建取消对象；他能够使用它们自己实际删除数据。cancelRequest执行删除操作。我不必为此手动编写代码。它是一个自动生成的对象。@GrantThomas可能是取消请求的集合通过其他方法发送到服务器。问题很简单，OP唯一不知道如何做的就是创建取消对象；他能够使用它们自己实际删除数据。感谢您的回复，但同样的问题仍然在发生，仍然试图删除相同的ID号。在原始代码中添加了额外的代码以更好地解释它。现在，我正在尝试一些额外的事情，看看我是否能找到它，但任何建议都是伟大的！谢谢当我调试代码时，我看到当我看到“_request2.CustID=CustID”时，它已经为CustID分配了相同的ID号，但我猜它不会将其更改为我们存储在列表中的数字列表。感谢您的响应，但同样的问题仍然在发生，仍在尝试删除相同的ID号。在原始代码中添加了其他代码以更好地解释它。现在，我正在尝试一些额外的事情，看看我是否能找到它，但任何建议都是伟大的！谢谢当我调试代码时，我看到当我看到“_request2.CustID=CustID”时，它已经为CustID分配了相同的ID号，但我猜它不会将其更改为我们存储在列表中的数字列表。

SearchRequest _request;
CancelRequest _request2;

SearchResponse _response;
CancelResponse _response2;

public void ArrangeRequest() {
    _request=new CustomerSearchRequest();
    _request.Company="Test Inc. ";
}

var customerIds=_response.Customers.Select(c => c.CustID).ToList();

foreach(var custID in customerIds) {
    _request2=new CancelRequest();
    _request2.CustID=custID;
    _request2.Company=_request.Company;
}

public void Response() {
    var ws=new RunEngine();

    _response=ws.SearchCust(new AppHeader(), _request) as SearchResponse;
    _response2=ws.CancelCust(new AppHeader(), _request2) as CancelResponse;
}

    var requestList = new List<CancelRequest>();
    var customerIds = _response.Customers.Select(c => c.CustID).ToList();
    foreach (var custID in customerIds)
    {
        _request = new CancelRequest(); 
        _request.CustID = custID;
        _request.Company = _request.Company;
        requestList.Add(_request);
    }

List<CancelRequest> _cancelRequests;

var customerIds = _response.Customers.Select(c => c.CustID);
_cancelRequests = customerIds.Select(custID => new CancelRequest { 
                          CustID = custID,
                          Company = _request.Company
                  }).ToList();

partial class Listener /* I named it, to put your code */ {
    SearchRequest _request;
    CancelRequest _request2;

    SearchResponse _response;
    CancelResponse _response2;

    public void ArrangeRequest() {
        _request=new CustomerSearchRequest();
        _request.Company="Test Inc. ";
    }

    void NowhereMethod() {
        var customerIds=_response.Customers.Select(c => c.CustID).ToList();

        foreach(var custID in customerIds) {
            _request2=new CancelRequest();
            _request2.CustID=custID;
            _request2.Company=_request.Company;
        }
    }

    public void ResponseOriginal() {
        var ws=new RunEngine();

        _response=ws.SearchCust(new AppHeader(), _request) as SearchResponse;
        _response2=ws.CancelCust(new AppHeader(), _request2) as CancelResponse;
    }

    public void Response() /* tried to correct */ {
        var ws=new RunEngine();

        _response=ws.SearchCust(new AppHeader(), _request) as SearchResponse;

        var customerIds=_response.Customers.Select(c => c.CustID).ToList();

        foreach(var custID in customerIds) {
            _request2=new CancelRequest();
            _request2.CustID=custID;
            _request2.Company=_request.Company;

            // Seems it should be like this
            // but note the assignment might be wrong, it's according to what `CancelCust` returns
            // for the correct way to make it a list of Customer is appeared in other answers 
            _response2=ws.CancelCust(new AppHeader(), _request2) as CancelResponse;
        }
    }
}

partial class Customer {
    public String CustID;
}

partial class Response {
    public List<Customer> Customers;
}

partial class Request {
    public String Company;
    public String CustID;
}

partial class SearchResponse: Response {
}

partial class CancelResponse: Response {
}

partial class SearchRequest: Request {
}

partial class CancelRequest: Request {
}

partial class CustomerSearchRequest: SearchRequest {
}

partial class AppHeader {
}

partial class RunEngine {
    public Response SearchCust(AppHeader appHelper, Request request) {
        // I don't know what it's like
        throw new NotImplementedException();
    }

    public Response CancelCust(AppHeader appHelper, Request request) {
        // I don't know what it's like
        throw new NotImplementedException();
    }
}

partial class Customer {
    // Company was not appearing used in the code
    public String CustID;
}

partial class Request {
    public String Company;
    public String CustID;
}

partial class Customer {
    public String Company;
    public String CustID;
}

partial class Request: Customer {
}