C#，如何从基于托盘的应用程序调用表单对象 [英] C#, how to call a form object from a tray based application

问题描述

我正在尝试从最初使用的作为托盘图标运行的程序加载表单类

I am trying to load a form class from a program running as a tray icon that originally used

FileList frmFileList = new FileList();

现在我想使用自定义表单而不是文件列表，但出现错误:

Now instead of a filelist I want to use a custom form but I get the error:

错误 1'System.Windows.Forms.Control.ControlCollection'不包含定义'Cast' 和无扩展方法 'Cast'接受类型的第一个参数'System.Windows.Forms.Control.ControlCollection'可以找到(你错过了using 指令或程序集参考?)

Error 1 'System.Windows.Forms.Control.ControlCollection' does not contain a definition for 'Cast' and no extension method 'Cast' accepting a first argument of type 'System.Windows.Forms.Control.ControlCollection' could be found (are you missing a using directive or an assembly reference?)

有什么想法吗?

推荐答案

听起来您好像忘记了源文件顶部的 using System.Linq; .但是因为你没有发布来源，我不能肯定地说.发布导致错误消息的代码行以及同一文件中的 using 指令会有所帮助.

It sounds like you forgot using System.Linq; at the top of your source file. But since you didn't post the sources, I can't say for sure. Posting the line of code that causes the error message, and the using directives that are in that same file would help.

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