从0自学C#05--窗体之间的相互访问
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2022-05-06 10:27:52
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在父窗体上,改变CheckBox控件的状态,实现子窗体的打开和关闭。在子窗体上,点击关闭按钮后,父窗体CheckBox控件变为未选中状态。
1.方法
这里用委托事件的方法,实现窗体的相互访问。
2.父窗体(主窗体)
父窗体上放置5个CheckBox控件。并将他们赋值到CheckBox[]数组,以便代码进行循环调用。
CheckBox[] checkBox;public MainFormBERT() { InitializeComponent(); checkBox = new CheckBox[5]; checkBox[0] = this.checkBox1; checkBox[1] = this.checkBox2; checkBox[2] = this.checkBox3; checkBox[3] = this.checkBox4; checkBox[4] = this.checkBox5; }
给CheckBox控件添加事件。并定义OpenOrCloseSubFormPPG(int i)方法实现打开或关闭子窗体。该方法调用了子窗体的事件,以相应RecvInfo(int number)方法,设置CheckBox控件为未选中状态:
subFormPPGTx[i].SendToParent += new SubFormPPG.SendFun(RecvInfo);
private void checkBox1_CheckedChanged(object sender, EventArgs e) { OpenOrCloseSubFormPPG(0); }private void checkBox2_CheckedChanged(object sender, EventArgs e) { OpenOrCloseSubFormPPG(1); }private void checkBox3_CheckedChanged(object sender, EventArgs e) { OpenOrCloseSubFormPPG(2); }private void checkBox4_CheckedChanged(object sender, EventArgs e) { OpenOrCloseSubFormPPG(3); }private void checkBox5_CheckedChanged(object sender, EventArgs e) { OpenOrCloseSubFormPPG(4); } SubFormPPG[] subFormPPGTx = { null, null, null, null, null};private void OpenOrCloseSubFormPPG(int i) { try { if (checkBox[i].Checked) { string formTitle, formName; if (i < 0 || i > 4) { throw new IndexOutOfRangeException("Channel is out of range"); } else if (i == 4) { formTitle = "ParallelWrite"; formName = "subFormPPG" + formTitle; } else { formTitle = "Tx" + i; formName = "subFormPPG" + formTitle; } if (subFormPPGTx[i] == null || subFormPPGTx[i].IsDisposed) { subFormPPGTx[i] = new SubFormPPG(); subFormPPGTx[i].Text = formTitle; subFormPPGTx[i].Name = formName; subFormPPGTx[i].Tag = i; subFormPPGTx[i].SendToParent += new SubFormPPG.SendFun(RecvInfo);//调用子窗体的事件 subFormPPGTx[i].Show(this); } else { subFormPPGTx[i].WindowState = FormWindowState.Normal; subFormPPGTx[i].Activate(); } } else { //subFormPPGTx[0].Close(); subFormPPGTx[i].Dispose(); subFormPPGTx[i] = null; } } catch (IndexOutOfRangeException ex) { MessageBox.Show(ex.Message); } catch (Exception ex) { MessageBox.Show(ex.Message); } }private void RecvInfo(int number) { this.checkBox[number].Checked = false; }
3.子窗体
添加事件SendToParent,当子窗体关闭时,响应事件,将信息传递给父窗体。
public delegate void SendFun(int number); public event SendFun SendToParent; private void SubFormPPG_FormClosed(object sender, FormClosedEventArgs e) { if (SendToParent != null) { SendToParent((int)this.Tag); } }
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