在用户控件之间传递数据 c#

本文介绍了在用户控件之间传递数据 c#的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

众所周知，有一些与此类似的解决方案，但我无法用它们解决我的问题.我有两个用户控件:

It's known that there are some solutions similar to this one, but I can't solve my problem with them. I have two user controls:

• 第一个创建一个 Report 对象.
• 第二个展示了它.

我有一个链接两个控件的主表单.

I have a main Form that links both controls.

这两个控件是在一个 DLL 中创建的，并添加到像这样的主要形式:

These two controls are created in a DLL, and are added to the main form like this:

//ADDS THE FIRST CONTROL TO THE PANEL CONTROL myDll.controlUserReport userControlA = new myDll.controlUserReport(); panelControl1.Controls.Add(userControlA); userControlA.Dock = DockStyle.Left; //ADDS THE SECOND CONTROL TO THE PANEL CONTROL myDll.controlDocViewer userControlB = new myDll.controlDocViewer(); panelControl1.Controls.Add(userControlB); userControlB.Dock = DockStyle.Fill;

如何将在单击按钮时在第一个控件 controlUserReport 中创建的 Report 对象传递给另一个用户控件 controlDocViewer 以显示它?

How can I pass the Report object, which is created in the first control controlUserReport when I click over a button, to the other user control controlDocViewer to show it?

推荐答案

您应该为此使用事件.在 UserControlA 中声明事件:

You should use events for this. In UserControlA declare the event:

//Declare EventHandler outside of class public delegate void MyEventHandler(object source, Report r); public class UserControlA { public event MyEventHandler OnShowReport; private void btnShowReport_Click(object sender, Report r) { OnShowReport?.Invoke(this, this.Report); } }

在UserControlB中订阅事件并显示报告:

In UserControlB subscribe to the event and show the report:

public class UserControlB { // Do it in Form_Load or so ... private void init() { userControlA.OnShowReport += userControlA_OnShowReport; } private void userControlA_OnShowReport(object sender, Report r) { // Show the report this.ShowReport(r); } }