需要知道如何创建DelegateCommand；返回一个整数值
这就是我正在尝试做的事情。请密切注意 InsertConlogEntry 以及我如何尝试将其分配给我的 DelegateCommand，但是，我如何处理返回 int？
谢谢你，
#region Members
public static readonly string AddConlogEntry = "AddConlogEntry";
public static readonly string GetConlogList = "GetConlogList";
public static readonly string GetConlogEntry = "GetConlogEntry";
public static readonly string Scope = "ConLog";
#endregion
#region Ctor
public ConLogCommands() :base()
{
scope = Scope;
DelegateCommand<ConlogEntryData> AddEntryCmd = new DelegateCommand<ConlogEntryData>("Add New Conlog Entry",
"AddConLogEntry", InsertConlogEntry);
this.Add(AddEntryCmd);
}
#endregion
#region Methods
private int InsertConlogEntry(ConlogEntryData data)
{
ConlogService service = new ConlogService();
return service.InsertConlogEntry(data.LoanNumber, data.UserId, data.Subject, data.Comment, data.EntryDate);
}
Here is what I am trying to do. Pay close attention to the InsertConlogEntry and how I am trying to assign it to my DelegateCommand, but, how do I handle the return int?
Thank you,
#region Members
public static readonly string AddConlogEntry = "AddConlogEntry";
public static readonly string GetConlogList = "GetConlogList";
public static readonly string GetConlogEntry = "GetConlogEntry";
public static readonly string Scope = "ConLog";
#endregion
#region Ctor
public ConLogCommands() :base()
{
scope = Scope;
DelegateCommand<ConlogEntryData> AddEntryCmd = new DelegateCommand<ConlogEntryData>("Add New Conlog Entry",
"AddConLogEntry", InsertConlogEntry);
this.Add(AddEntryCmd);
}
#endregion
#region Methods
private int InsertConlogEntry(ConlogEntryData data)
{
ConlogService service = new ConlogService();
return service.InsertConlogEntry(data.LoanNumber, data.UserId, data.Subject, data.Comment, data.EntryDate);
}
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命令是动作，而不是功能。因此，它们不应该返回任何值。
命令是响应某些输入而触发的操作。从技术上讲，逻辑应该是独立的。
话虽这么说，如果您只需要调用此方法并忽略结果，您可以将其包装在
Action中，并使用该方法构建委托命令：Commands are meant to be actions - not functions. As such, they shouldn't return any values.
A command is meant to be an action that fires in response to some input. The logic should, technically, be self-contained.
That being said, if you need to just call this method and ignore the results, you can wrap it in an
Action<ConlogEntryData>and build your delegate command with that:你不能。它只需要一个
Action。You can't. It only takes an
Action<T>.必须定义您自己的
DelegateCommand版本，该版本接受Func作为构造函数参数，而不是简单的Action< /代码>。 由于命令本身并不关心返回值，因此您可以像这样初始化它：
Not without defining your own version of
DelegateCommand<T>that accepts aFunc<T, int>as a constructor parameter rather than a simpleAction<T>.Since the command itself doesn't care about the return value, you can initialize it like this: