C# 将信息从一个窗体发送到另一个窗体Windows窗体

我有一个问题：我必须填写表格。一个表单有dataGridView和一个按钮。单击按钮时，创建Form2，在其中输入信息。这些信息需要添加到第一个表单上的dataGridView中。但当我点击表单2中的“添加”按钮时， 我有一个错误NullReferenceException未处理（对象引用未设置为对象的实例）。请帮帮我

表格1

表格2

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更新以下语句可以解决您的问题

private void Add_Click(object sender, EventArgs e)
{
    add_waibil_goods = new AddWaybilGoods();
    if (add_waibil_goods.ShowDialog(this) == DialogResult.OK)
    {
        dataGridView1.Rows.Add(add_waibil_goods.GoodsName2, add_waibil_goods.GoodsPrice2, add_waibil_goods.GoodsCount2);
        dataGridView1.Update();
    }
}

添加到dataGridView1时，您似乎引用了Form1中的属性。您还需要启动form2作为模式窗口。模式窗口将确保用户在应用程序继续之前填写正确的数据

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要访问

Form2

中的

Form1

公共成员，您可以将相同的实例发送到构造函数中的Form1

请参阅以下代码：

表格1：

private void Add_Click(object sender, EventArgs e)
{
    add_waibil_goods = new AddWaybilGoods(this); //parameterized constructor       
    add_waibil_goods.Show(this); //assign owner
    add_waibil_goods.Focus();
    dataGridView1.Rows.Add(GoodsName2,GoodsPrice2, GoodsCount2);
    dataGridView1.Update();
}

public partial class AddWaybilGoods : Form
{
    Waybil w_b = null;
    public string GoodsName1 = null;
    public string GoodsPrice1 = null;
    public string GoodsCount1 = null;

    public AddWaybilGoods(Waybil wb)
    {
        InitializeComponent();
        w_b= wb;
        Base base_ = new Base(Share.server_address, Share.login, Share.password, Share.database);
        base_.fill_combo(AddWaybilGoods1, "Goods", "GoodsName");
    }
    //... other methods
}

表格2：

private void Add_Click(object sender, EventArgs e)
{
    add_waibil_goods = new AddWaybilGoods(this); //parameterized constructor       
    add_waibil_goods.Show(this); //assign owner
    add_waibil_goods.Focus();
    dataGridView1.Rows.Add(GoodsName2,GoodsPrice2, GoodsCount2);
    dataGridView1.Update();
}

public partial class AddWaybilGoods : Form
{
    Waybil w_b = null;
    public string GoodsName1 = null;
    public string GoodsPrice1 = null;
    public string GoodsCount1 = null;

    public AddWaybilGoods(Waybil wb)
    {
        InitializeComponent();
        w_b= wb;
        Base base_ = new Base(Share.server_address, Share.login, Share.password, Share.database);
        base_.fill_combo(AddWaybilGoods1, "Goods", "GoodsName");
    }
    //... other methods
}

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您在哪一行收到异常？请解释一下。