使用lambda进行winforms事件有什么问题吗? [英] Is there anything wrong with using lambda for winforms event?

问题描述

这是一个非常简单的问题.我之所以问是因为我从未见过它，这让我想知道是否出了什么问题.

This is a very simple question. I'm asking because I've never seen it before which makes me wonder if there's something wrong.

comboBox1.MouseEnter += (a, b) => comboBox1.Focus();
campaignDataGridView.MouseEnter += (a, b) => campaignDataGridView.Focus();

推荐答案

这是完全可以接受的，但是，由于这些是匿名委托，因此无法取消订阅事件处理程序.

This is perfectly acceptable, however, since these are anonymous delegates, there is no way to unsubscribe the event handler.

也就是说:

// Subscribe lambda as event handler
comboBox1.MouseEnter += (a, b) => comboBox1.Focus(); 

// Try to unsubscribe a _different_ lambda with identical syntax. 
// The first lambda is still subscribed
comboBox1.MouseEnter -= (a, b) => comboBox1.Focus(); 

是否有问题取决于您的应用程序和使用情况.

Whether that is a problem or not depends on your application and use.

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