如何基于子窗体中的另一个更新文本框? [英] How to update a textbox based on another in its subform?

问题描述

我可以将字段从父表单更新为子表单，但不会发生反向错误
请帮助我


在表单之间将数据从子表单传递到主表单

i can update fields from parent to child form but reverse is not happening
please help me


Passing Data Between Forms from sub form to main form

推荐答案

假定从Form1中打开了Form2.

在Form2中创建事件:

Assuming Form2 is opened from Form1.

Create an event in Form2:

public event EventHandler Changed;

protected virtual void OnChanged(EventArgs e)
    {
    EventHandler eh = Changed;
    if (eh != null)
        {
        eh(this, e);
        }
    }

private void DoSomethingToChangeData()
    {
    OnChanged(null);
    }

创建Form2的实例时，请在Form1中为Changed事件添加一个处理程序:

When you create the instance of Form2, add a handler in Form1 for the Changed event:

frmNew f = new frmNew();
f.Changed += new EventHandler(f_Changed);
f.Show();

事件触发时，对其进行处理并获取数据.

When the event fires, handle it and get the data.

void f_Changed(object sender, EventArgs e)
    {
    frmNew f = sender as frmNew;
    if (f != null)
        {
        textBox1.Text = f.PropertyToGetTheText;
        }
    }

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