C# 在c语言中，将值从一种形式传递到另一种形式

我必须用C语言将id从一个表单传递到另一个表单

我不能这样做

C代码是：

private void btnedit_Click(object sender, EventArgs e)
{
    foreach (DataGridViewRow a in dataGridViewUnPaidList.Rows) 
    {
        if (a.Cells[0].Value != null)
        {
            Convert.ToInt64(a.Cells[1].Value); // i have to pass this id in AddInvoice() form
            AddInvoice ad = new AddInvoice();
            ad.Show();
            NonPaideData non = new NonPaideData();
            non.Hide();
        }
        else
        {
        MessageBox.Show("Now Row Is Selected");
        }
    }
}

有人能告诉我我做错了什么吗？

另外创建一个属性：

分配给它：

private void btnedit_Click(object sender, EventArgs e)
{
    foreach (DataGridViewRow a in dataGridViewUnPaidList.Rows)
    {
        if (a.Cells[0].Value != null)
        {
            AddInvoice ad = new AddInvoice();
            ad.CellValue = Convert.ToInt64(a.Cells[1].Value);
            ad.Show();

            NonPaideData non = new NonPaideData();
            non.Hide();
        }
        else
        {
            MessageBox.Show("Now Row Is Selected");
        }
    }

只需在AddInvoice中将其用作CellValue

哦，如果这就是代码，我想你可能是这个意思；不要创建新的非辅助数据并将其隐藏。

在AddInvoice中创建属性：

分配给它：

private void btnedit_Click(object sender, EventArgs e)
{
    foreach (DataGridViewRow a in dataGridViewUnPaidList.Rows)
    {
        if (a.Cells[0].Value != null)
        {
            AddInvoice ad = new AddInvoice();
            ad.CellValue = Convert.ToInt64(a.Cells[1].Value);
            ad.Show();

            NonPaideData non = new NonPaideData();
            non.Hide();
        }
        else
        {
            MessageBox.Show("Now Row Is Selected");
        }
    }

只需在AddInvoice中将其用作CellValue

哦，如果这就是代码，我想你可能是这个意思；而不是创建新的非助手数据并将其隐藏在Form1中。

private void ShowForm2()
{
    string value = TheTextBox.Text;
    Form2 newForm = new Form2();
    newForm.TheValue = value;
    newForm.ShowDialog();
}

表格2

private string _theValue;
public string TheValue 
{ 
    get
    {
        return _theValue;
    }
    set
    {
        _theValue = value; 
        // do something with _theValue so that it
        // appears in the UI

    }
}

看到这段代码，我想这会对您有所帮助。

格式1

private void ShowForm2()
{
    string value = TheTextBox.Text;
    Form2 newForm = new Form2();
    newForm.TheValue = value;
    newForm.ShowDialog();
}

表格2

private string _theValue;
public string TheValue 
{ 
    get
    {
        return _theValue;
    }
    set
    {
        _theValue = value; 
        // do something with _theValue so that it
        // appears in the UI

    }
}

看到这个代码，我想这会对你有所帮助