Question

我的应用程序中有两个Windows窗体。第一个是Main表单，第二个是Lookup表单。我试图在文本框键离开事件中从主窗体打开查找表单，然后打开查找表单。我的查找表单具有数据网格视图，并且正在将其加载到查找表单的表单加载事件中。我正在将查询窗口的网格视图上的所选值读取到对象。我想在将所选行的值读取到对象并将其传递给主窗体后立即关闭查找窗口？我怎样才能做到这一点？这就是我所做的。在主要形式中。

        LookupModelType="";
        if (e.KeyCode.Equals(Keys.F3))
        {
            foreach (Form frm in Application.OpenForms)
            {
                if (frm is FormControllers.Lookup)
                {
                    if (frm.WindowState == FormWindowState.Minimized)
                    {
                        frm.WindowState = FormWindowState.Normal;
                        frm.Focus();
                        return;
                    }
                }
            }
                LookupModelType = "Product";
                FormControllers.Lookup newLookUp = new FormControllers.Lookup(LookupModelType);                
                newLookUp.ShowDialog(this);
        }

在查找窗口中

  private string GridType = "";
        public Lookup(String  LookupModelType)
        {
            InitializeComponent();
            this.GridType = LookupModelType; 
        }

        private void Lookup_Load(object sender, EventArgs e)
        {
            if (GridType == "Product")
            {
                using(DataControllers.RIT_Allocation_Entities RAEntity  = new DataControllers.RIT_Allocation_Entities())
                {
                    dgvLookup.DataSource = RAEntity.TBLM_PRODUCT.ToList<DataControllers.TBLM_PRODUCT>();
                }  
            }
            dgvLookup.ReadOnly = true;
        }

        private void dgvLookup_CellClick(object sender, DataGridViewCellEventArgs e)
        {
            if (e.RowIndex < 0)
            {
                return;
            }
            int index = e.RowIndex;
            dgvLookup.Rows[index].Selected = true;
        }

Answer 1

您可以像打击一样做到这一点：

的主要形式：

   private void textBox1_KeyDown(object sender, KeyEventArgs e)
    {
        if (e.KeyCode == Keys.F3)
        {
            LookupForm look = new LookupForm();
            var result  = look.ShowDialog();

            if(result == DialogResult.OK)
            {
                MessageBox.Show(look.data.ToString());
            }
        }
    }

在查找表格中，您必须声明1个变量并在每次单击单元格时进行填充

public partial class LookupForm : Form
{
    public object data = new object();
    private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
    {
        data = dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value;
        this.DialogResult = DialogResult.OK;
        this.Close();
    }
}

当然，为了获得更好的性能，您可以声明特定类型的变量

Answer 2

要使用事件在“父子”表单之间共享数据，这是需要做的事情：

用于共享数据的公共自定义事件args类。
要参加活动的子表格。
在您创建父级实例时，以父级形式，您需要注册事件处理程序

请注意，下面的代码只是一个演示代码，您将需要添加null检查等以使其“健壮”。

下面的自定义事件参数

public class ValueSelectedEventArgs : EventArgs
{
    public object Value { get; set; }
}

您的查找表单应声明以下事件：

        public event EventHandler ValueSelected;

        protected virtual void OnValueSelected(ValueSelectedEventArgs e)
        {
            EventHandler handler = ValueSelected;
            if (handler != null)
            {
                handler(this, e);
            }

            // if you are using recent version of c# you can simplyfy the code to ValueSelected?.Invoke(this, e);     
        }

就我而言，我在选定索引更改的列表框上触发事件，并且还关闭了表单。代码：

        private void checkedListBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            var i = this.checkedListBox1.SelectedIndex;
            ValueSelectedEventArgs args = new ValueSelectedEventArgs();
            args.Value = i;
            OnValueSelected(args);
            this.Close();
        }

最后在父表单中，您必须注册事件处理程序

private void textBox1_Leave(object sender, EventArgs e)
{
    lookup myLookup = new lookup();
    myLookup.ValueSelected += MyLookup_ValueSelected;
    myLookup.Show();
}

    private void MyLookup_ValueSelected(object sender, EventArgs e)
    {
        textBox2.Text = (e as ValueSelectedEventArgs).Value.ToString();

    }

Answer 3

我个人喜欢动态添加查找窗口，并且执行以下操作：

        //examble object
        class Person
        {
            public string FirstName { get; set; }
            public string LastName { get; set; }
        }
        // the value which you want to get from datagridview
        private Person _selectedValue;
        // the datagridview datasource, which you neet to set 
        private IEnumerable<Person> _gridDataSource = 
            new List<Person>()
                {
                    new Person {FirstName="Bob",LastName="Smith" },
                    new Person {FirstName="Joe",LastName="Doe"}
                };

        private void textBox1_KeyDown(object sender, KeyEventArgs e)
        {
            if(e.KeyCode== Keys.F3)
            {
                var btnOk = new Button() { Text = "Ok", Anchor= AnchorStyles.None };
                var btnCancel = new Button() { Text = "Cancel",Anchor= AnchorStyles.Right };

                var dg = new DataGridView();
                var bs = new BindingSource();
                bs.DataSource = _gridDataSource;
                dg.DataSource = bs;
                dg.Dock = DockStyle.Fill;
                dg.SelectionMode = DataGridViewSelectionMode.FullRowSelect;

                //setup a layout wich will nicely fit to the window
                var layout = new TableLayoutPanel();
                layout.Controls.Add(dg, 0, 0);
                layout.SetColumnSpan(dg, 2);
                layout.Controls.Add(btnCancel, 0, 1);
                layout.Controls.Add(btnOk, 1, 1);
                layout.RowStyles.Add(new RowStyle(SizeType.Percent));
                layout.RowStyles.Add(new RowStyle(SizeType.AutoSize));
                layout.ColumnStyles.Add(new ColumnStyle(SizeType.Percent));
                layout.ColumnStyles.Add(new ColumnStyle(SizeType.AutoSize));
                layout.Dock = DockStyle.Fill;

                //create a new window and add the cotnrols
                var window = new Form();
                window.StartPosition = FormStartPosition.CenterScreen;
                window.Controls.Add(layout);


                // set the ok and cancel buttons of the window
                window.AcceptButton = btnOk;
                window.CancelButton = btnCancel;
                btnOk.Click += (s, ev) => { window.DialogResult = DialogResult.OK; };
                btnCancel.Click += (s, ev) => { window.DialogResult = DialogResult.Cancel; };

                //here we show the window as a dialog
                if (window.ShowDialog() == DialogResult.OK)
                {
                        _selectedValue =(Person) bs.Current;
                        MessageBox.Show(_selectedValue.FirstName);
                }
            }
}

将对象从一种窗口形式传递到另一种形式

3 个答案: