c# - 如何在 wpf 中调用 KeyEventArgs 方法

Question

在列表框内，如果双击列表框项，列表框项的值分配给列表框内的动态文本框。(我在列表框内创建了一个动态文本框)。然后我需要修改文本框值。之后单击 enter 键，将文本框值添加到列表框项中，然后将动态文本框删除。单击 esc 键时，将初始值添加到列表框项中。

我在 MouseEventArg 方法内部遇到问题，如何调用 keyeventArgs 方法。

C#

  System.Windows.Controls.TextBox dynamicTextBox = new System.Windows.Controls.TextBox();

    string previousvalue;

    private void items_MouseDoubleClick(object sender, MouseButtonEventArgs e)
    {
        //Get the index value
        var index = lstbxindex.Items.IndexOf(lstbxindex.SelectedItem);


        //set the textbox height and width property 
        dynamicTextBox.Width = 230;
        dynamicTextBox.Height = 50;

        //Add a textbox to the listbox 
        this.lstbxindex.Items.Add(dynamicTextBox);

        //To assign the selectedITem values to textbox
        dynamicTextBox.Text = lstbxindex.SelectedItem.ToString();

        //Get the textbox values before editing
        previousvalue = dynamicTextBox.Text;

        //Remove the values from the listbox item
        lstbxindex.Items.RemoveAt(index);


        dynamicTextBox.AcceptsReturn = true;

    }




private void checkenterclicked(object sender, System.Windows.Forms.KeyEventArgs e)
    {
        if (e.KeyCode == Keys.Enter)
        {
            EnterClicked(sender, e);
            //dynamicTextBox.PreviewKeyDown += EnterClicked;
        }
    }

    private void EnterClicked(object sender, System.Windows.Forms.KeyEventArgs e)
    {
        if (e.KeyCode == Keys.Enter)
        {
            using (DatabaseConnector databaseConnection = new DatabaseConnector(ApplicationConstants.ConnectionString))
            using (ProjectsTable projectsTable = new ProjectsTable(databaseConnection))
            {


                //Here Filter the Name from project Table which DbActive state is zero
                projectsTable.AddFilter(new Filter<ProjectsColumnTypes>(ProjectsColumnTypes.DbActive, CompareOperator.Equals, true));
                projectsTable.Read();

                projectsTable.AddFilter(new Filter<ProjectsColumnTypes>(ProjectsColumnTypes.Name, CompareOperator.Equals, dynamicTextBox.Text));

                projectsTable.Read();

                foreach (DtoProjectsRow row in projectsTable.Rows)
                {
                    //Guid DbId = row.DbId;
                    Guid DbId = row.DbId;

                    var UpdateRow = projectsTable.NewRow();


                    UpdateRow.Name = dynamicTextBox.Text;

                    UpdateRow.DbId = DbId;


                    UpdateRow.DbActive = true;

                    // Alter the row to the table.
                    projectsTable.AlterRow(UpdateRow);

                    // Write the new row to the database.
                    projectsTable.Post();

                    //Add the items in comboBox
                    lstbxindex.Items.Add(dynamicTextBox.Text);
                }
                // dynamicTextBox = e.Source as System.Windows.Controls.TextBox;

            }
        }
        else
        {
            if (e.KeyCode == Keys.Escape)
            {
                lstbxindex.Items.Add(previousvalue);
                lstbxindex.Items.Remove(dynamicTextBox);
            }
        }
    }

Answer 1

试试这个:

订阅您的动态文本框按键事件。把它放在构造函数中。例如:

System.Windows.Controls.TextBox dynamicTextBox = new System.Windows.Controls.TextBox();

string previousvalue;

    public MainWindows()
    {
        InitializeComponent();

        //subscribe to previewKeyDown, KeyDown will not work for enter key
        dynamicTextBox.PreviewKeyDown += dynamicTextBox_KeyDown;
    }

    // this will hit if any key is pressed
    void dynamicTextBox_KeyDown(object sender, KeyEventArgs e)
    {
        if (e.Key == Key.Enter)
        {
             using (DatabaseConnector databaseConnection = new DatabaseConnector(ApplicationConstants.ConnectionString))
             using (ProjectsTable projectsTable = new ProjectsTable(databaseConnection))
            {


            //Here Filter the Name from project Table which DbActive state is zero
            projectsTable.AddFilter(new Filter<ProjectsColumnTypes>(ProjectsColumnTypes.DbActive, CompareOperator.Equals, true));
            projectsTable.Read();

            projectsTable.AddFilter(new Filter<ProjectsColumnTypes>(ProjectsColumnTypes.Name, CompareOperator.Equals, dynamicTextBox.Text));

            projectsTable.Read();

            foreach (DtoProjectsRow row in projectsTable.Rows)
            {
                //Guid DbId = row.DbId;
                Guid DbId = row.DbId;

                var UpdateRow = projectsTable.NewRow();


                UpdateRow.Name = dynamicTextBox.Text;

                UpdateRow.DbId = DbId;


                UpdateRow.DbActive = true;

                // Alter the row to the table.
                projectsTable.AlterRow(UpdateRow);

                // Write the new row to the database.
                projectsTable.Post();

                //Add the items in comboBox
                lstbxindex.Items.Add(dynamicTextBox.Text);
            }
            // dynamicTextBox = e.Source as System.Windows.Controls.TextBox;

        }
    }

private void items_MouseDoubleClick(object sender, MouseButtonEventArgs e)
{
    //Get the index value
    var index = lstbxindex.Items.IndexOf(lstbxindex.SelectedItem);


    //set the textbox height and width property 
    dynamicTextBox.Width = 230;
    dynamicTextBox.Height = 50;

    //Add a textbox to the listbox 
    this.lstbxindex.Items.Add(dynamicTextBox);

    //To assign the selectedITem values to textbox
    dynamicTextBox.Text = lstbxindex.SelectedItem.ToString();

    //Get the textbox values before editing
    previousvalue = dynamicTextBox.Text;

    //Remove the values from the listbox item
    lstbxindex.Items.RemoveAt(index);


    dynamicTextBox.AcceptsReturn = true;

}