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从0自学C#05--窗体之间的相互访问

程序员文章站 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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