How can I change the color of certain dates in the MonthCalendar control?

问题

How can I change the color of certain dates in the MonthCalendar control in VB.NET?

For example, I need to change the color of Jan 21 to Red, Sundays to Orange and so on...

回答1:

This is not possible. There is no built-in way of customizing the way that individual days or dates are displayed on the MonthCalendar control.

You could owner-draw the control, but that's way too much work to justify. This will make you responsible for drawing the entire control yourself. Note that if you choose to go this route, the MonthCalendar control does not raise the Paint event because the base control sets the UserPaint bit to "False". You will have to subclass the control and override its OnPrint method instead.

I can't personally recommend any third-party controls that provide this level of customization, but a quick Google search does appear to turn up a few options:

• Another Month Calendar
• Customizable MonthCalendar Type Control
• MonthCalendar Calendar - Control

回答2:

Try this:

Private Sub pintaCalendarioNaData(ByRef mc As MonthCalendar, ByVal data As Date, ByVal cor As String)
        Dim gMonthCalendar As Graphics = mc.CreateGraphics()
        Dim oHTIMonths As MonthCalendar.HitTestInfo
        Dim arrDates As New ArrayList()
        Try
            For intRows As Integer = 1 To mc.Size.Width - 1
                For intCols As Integer = 1 To mc.Size.Height - 1
                    oHTIMonths = mc.HitTest(intRows, intCols)
                    If oHTIMonths.HitArea = MonthCalendar.HitArea.Date Then
                        If CDate(mc.HitTest(intRows, intCols).Time) = CDate(data) Then
                             gMonthCalendar.DrawRectangle(New Pen(ColorTranslator.FromHtml(cor), 2), intRows, intCols, 24, 15)
                            GoTo fim
                        End If
                    End If
                Next intCols
            Next intRows
fim:
        Catch ex As Exception
            MessageBox.Show("Error: " & vbNewLine & ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
            Err.Clear()
        Finally

        End Try
    End Sub

This sub paints one MonthCalendar (mc) in one specific date (data) with one color (cor)

回答3:

In Visual Studio 2005, you drag a monthcalendar from the toolbox.

Go to the properties.

There's annually bolded dates, monthly bolded dates and bolded dates. You can add the dates you want in those properties.

回答4:

Step 1: Drag grid view Control and calender on the web form or window form:

step 2: paste the coding on .cs page

using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Drawing;

public partial class frmCalander : System.Web.UI.Page
{
    SqlConnection con= new SqlConnection();
    SqlDataAdapter myda;
    DataSet ds = new DataSet();
    DataSet dsSelDate;
    String strConn;
    protected void Page_Load(object sender, EventArgs e)
    {
        con.ConnectionString = ConfigurationManager.ConnectionStrings["STUDENTConnectionString"].ConnectionString;
        myda = new SqlDataAdapter("Select * from EventTable", con);
        myda.Fill(ds, "Table");

    }
    protected void Calendar1_DayRender(object sender, DayRenderEventArgs e)
    {
        if (! e.Day.IsOtherMonth )
        {
                foreach (DataRow dr in ds.Tables[0].Rows)
                {
                    if ((dr["EventDate"].ToString() != DBNull.Value.ToString()))
                    {
                        DateTime dtEvent= (DateTime)dr["EventDate"];
                        if (dtEvent.Equals(e.Day.Date))
                        {
                            e.Cell.BackColor = Color.PaleVioletRed;
                        }
                    }
                }
        }
//If the month is not CurrentMonth then hide the Dates
        else
        {
                e.Cell.Text = "";
        }
    }


    protected void Calendar1_SelectionChanged(object sender, EventArgs e)
    {
        myda = new SqlDataAdapter("Select EventId, EventName, EventLocation, Convert(varchar,EventDate,105) as EventDate  from EventTable where EventDate='" + Calendar1.SelectedDate.ToString() + "'", con);
        dsSelDate = new DataSet();
        myda.Fill(dsSelDate, "AllTables");
        if (dsSelDate.Tables[0].Rows.Count == 0)
        {
            GridView1.Visible = false;
        }
        else
        {
            GridView1.Visible = true;
            GridView1.DataSource = dsSelDate;
            GridView1.DataBind();
        }

    }

来源：https://stackoverflow.com/questions/5048872/how-can-i-change-the-color-of-certain-dates-in-the-monthcalendar-control