如何从用户控件将行添加到 dataGridView

Question

我有这个带有按钮和面板的表单。当我按下按钮时，我想向 dataGridView1

添加一行

用户控制码：

public partial class UserControl1 : UserControl
{
    private static UserControl1 _instance;
    public static UserControl1 Instance
    {
        get
        {
            if (_instance == null)
                _instance = new UserControl1();
            return _instance;
        }
    }
    public UserControl1()
    {
        InitializeComponent();
    }
    public void setRow()
    {
        String[] row = { "TEST", "TEST", "TEST", "TEST" };
        dataGridView1.Rows.Add(row);
    }
}

Form1代码：

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
        panel1.Controls.Add(new UserControl1());
        UserControl1.Instance.Dock = DockStyle.Fill;
        UserControl1.Instance.BringToFront();
    }

    private void Form1_Load(object sender, EventArgs e)
    {

    }


    private void button1_Click(object sender, EventArgs e)
    {
        UserControl1 user = new UserControl1();
        user.setRow();
    }

    private void button2_Click(object sender, EventArgs e)
    {

    }
}

Answer 1

private void button1_Click(object sender, EventArgs e)
{
    UserControl1 user = new UserControl1();
    user.setRow();
}

应该是

private void button1_Click(object sender, EventArgs e)
{
    UserControl1.Instance.setRow();
}

UserControl1 的构造函数应该类似于

public UserControl1()
{
    _instance = this;
    InitializeComponent();
}

在您的代码中，您正在创建 3 个 UserControl 实例，而您似乎只想拥有一个。当您在其中一个实例上调用方法时，它绝不会影响其他实例。

如何从用户控件将行添加到 dataGridView

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