ReactiveCommand 不尊重 canExecute [英] ReactiveCommand not respecting canExecute

问题描述

也许我遗漏了一些东西，但是我无法获得 ReactiveCommand 以阻止基于 canExecute observable 的执行.

Perhaps I'm missing something, however I can't get ReactiveCommand to prevent execution based on the canExecute observable.

下面是我能想到的最简单的例子.我希望命令永远不会开火，但它确实如此.

Below is the simplest example I can conjure. I would expect the command to never fire, however it is.

我错过了什么?

void Main()
{
    var canExecute = Observable.Return(false);
    var myCommand = ReactiveCommand.CreateAsyncTask(canExecute, m => functions.doAllThings(m));

    myCommand.Subscribe(x=>"executing".Dump());

    myCommand.Execute("Tom"); // This fires the command. I would have expected it to block
}

static class functions
{
    public static Task doAllThings(object message)
    {
        var result = Task.Run(() =>{
                    "running task...".Dump();
                    return "hello " + (string)message;});

        return result;
    }
}

注意 - 这是一个来自从另一个命令执行命令的分叉"问题.我相信这更多是核心问题.

Note - This is question is kind of a 'fork' from Executing a command from another command. I believe that this is more the core issue.

推荐答案

这是特意设计的.ReactiveUI 不会阻止您显式调用 Execute/ExecuteAsync，并且相信您知道自己在做什么™

This is by-design. ReactiveUI doesn't stop you from explicitly calling Execute / ExecuteAsync, and trusts that You Know What You're Doing™

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