Question

我正在尝试添加一个日历，例如选择月份和年份的自定义用户控件。在用户控制代码中，我将两个属性Month和Year设置为当前月份和年份。

public MonthPicker()
    {
        InitializeComponent();
        m_MonthLabels = new Label[]
        {
        lblJanuary,
        lblFebruary,
        lblMarch,
        lblApril,
        lblMay,
        lblJune,
        lblJuly,
        lblAugust,
        lblSeptember,
        lblOctober,
        lblNovember,
        lblDecember
        };

        m_NotSelected = new Font("Sans Serif", 8.25F, FontStyle.Regular);
        m_Selected = new Font("Sans Serif", 8.25F, FontStyle.Bold);
        Month = DateTime.Now.Month;
        Year = DateTime.Now.Year;
        lblYear.Text = Year.ToString();
        groupBox2.Visible = false;
        groupBox1.Height = 20;
        CalendarIsDisplayed = false;
        CalendarIsNotChanged = false;
        SetMonthLabelSelected(Month);
    }

但是，当我将其包含在我的应用程序表单中时，设计器会获取月份和年份的硬编码值。因此，当月份发生变化时，它仍会显示我的月份。

        // tsMonthPicker
        // 
        this.tsMonthPicker.BackColor = System.Drawing.SystemColors.Control;
        this.tsMonthPicker.CalendarIsDisplayed = false;
        this.tsMonthPicker.CalendarIsNotChanged = false;
        this.tsMonthPicker.Location = new System.Drawing.Point(104, 14);
        this.tsMonthPicker.Margin = new System.Windows.Forms.Padding(0);
        this.tsMonthPicker.Month = 1;
        this.tsMonthPicker.Name = "tsMonthPicker";
        this.tsMonthPicker.Size = new System.Drawing.Size(215, 20);
        this.tsMonthPicker.TabIndex = 6;
        this.tsMonthPicker.Value = new System.DateTime(2017, 1, 1, 0, 0, 0, 0);
        this.tsMonthPicker.Year = 2017;
        this.tsMonthPicker.Change += new Time_and_Billing_System.MonthPicker.MonthPickerChangeHandler(this.tsMonthPicker_Changed);
        this.tsMonthPicker.Load += new System.EventHandler(this.tsMonthPicker_Load);

如何更改用户控件中的代码，以便表单设计器文件自动执行 -

this.tsMonthPicker.Month = System.DateTime.Now.Month;
this.tsMonthPicker.Year = System.DateTime.Now.Year;

Answer 1

将这两行放在Form_Load方法中，用于嵌入此MonthPicker的表单。

    private void Form1_Load(object sender, EventArgs e)
    {
        this.tsMonthPicker.Month = System.DateTime.Now.Month;
        this.tsMonthPicker.Year = System.DateTime.Now.Year;
    }

在对象查看器中，选择Form对象时，选择Events视图（Lightning Bolt），在列表中找到Load，双击该空格，此方法将出现在代码中。

Answer 2

您可以使用DesignMode属性。如果每次启动应用程序时都需要默认值Now，则不要说明。如果是这种情况，那么您就不需要DesignMode。

public MonthPicker() 
{
    if (this.DesignMode)
    {
        //These values are only set when the control is created in design mode
        this.tsMonthPicker.Month = System.DateTime.Now.Month;
        this.tsMonthPicker.Year = System.DateTime.Now.Year;
    }
}

使用用户控件

2 个答案: