c# winforms - how to populate DataGridViewRowHeaders and FirstRow

Try something like the following:

public partial class Form1 : Form

{

private int displayedYear;

private int displayedMonth;

public Form1()

{

InitializeComponent();

}

private void Form1_Load(object sender, EventArgs e)

{

dataGridView1.ColumnCount = 31;

dataGridView1.RowCount = 1;

// first 28 days will be displayed whatever the month

for (int i = 0; i < 28; i++) dataGridView1.Columns[i].HeaderText = (i + 1).ToString();

// show current month initially

currentMonth.PerformClick();

}

private void SetFinalDays(int daysInMonth)

{

switch (daysInMonth)

{

case 28:

dataGridView1.Columns[28].HeaderText = "";

dataGridView1.Columns[29].HeaderText = "";

dataGridView1.Columns[30].HeaderText = "";

return;

case 29:

dataGridView1.Columns[28].HeaderText = "29";

dataGridView1.Columns[29].HeaderText = "";

dataGridView1.Columns[30].HeaderText = "";

return;

case 30:

dataGridView1.Columns[28].HeaderText = "29";

dataGridView1.Columns[29].HeaderText = "30";

dataGridView1.Columns[30].HeaderText = "";

return;

case 31:

dataGridView1.Columns[28].HeaderText = "29";

dataGridView1.Columns[29].HeaderText = "30";

dataGridView1.Columns[30].HeaderText = "31";

return;

}

private void DisplayDays()

{

DateTime dt = new DateTime(displayedYear, displayedMonth, 1);

label1.Text = dt.ToString("MMMM yyyy"); // show month DGV is displaying in label, say

int daysInMonth = DateTime.DaysInMonth(dt.Year, dt.Month);

SetFinalDays(daysInMonth);

for (int i = 0; i < daysInMonth; i++)

{

dataGridView1.Rows[0].Cells[i].Value = dt.DayOfWeek.ToString().Substring(0, 1);

dt = dt.AddDays(1);

}

for (int i = daysInMonth; i < 31; i++) dataGridView1.Rows[0].Cells[i].Value = "";

}

private void currentMonth_Click(object sender, EventArgs e)

{

displayedMonth = DateTime.Today.Month;

displayedYear = DateTime.Today.Year;

DisplayDays();

}

private void lastmonth_Click(object sender, EventArgs e)

{

int month = displayedMonth - 1;

if (month == 0)

{

displayedMonth = 12;

displayedYear--;

}

else

{

displayedMonth--;

}

DisplayDays();

}

private void nextMonth_Click(object sender, EventArgs e)

{

int month = displayedMonth + 1;

if (month == 13)

{

displayedMonth = 1;

displayedYear++;

}

else

{

displayedMonth++;

}

DisplayDays();

}

2 Replies

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Vulpes14y ago
Accepted answer
Try something like the following:

public partial class Form1 : Form
{
private int displayedYear;
private int displayedMonth;

public Form1()
{
InitializeComponent();
}

private void Form1_Load(object sender, EventArgs e)
{
dataGridView1.ColumnCount = 31;
dataGridView1.RowCount = 1;
// first 28 days will be displayed whatever the month
for (int i = 0; i < 28; i++) dataGridView1.Columns[i].HeaderText = (i + 1).ToString();
// show current month initially
currentMonth.PerformClick();
}

private void SetFinalDays(int daysInMonth)
{
switch (daysInMonth)
{
case 28:
dataGridView1.Columns[28].HeaderText = "";
dataGridView1.Columns[29].HeaderText = "";
dataGridView1.Columns[30].HeaderText = "";
return;
case 29:
dataGridView1.Columns[28].HeaderText = "29";
dataGridView1.Columns[29].HeaderText = "";
dataGridView1.Columns[30].HeaderText = "";
return;
case 30:
dataGridView1.Columns[28].HeaderText = "29";
dataGridView1.Columns[29].HeaderText = "30";
dataGridView1.Columns[30].HeaderText = "";
return;
case 31:
dataGridView1.Columns[28].HeaderText = "29";
dataGridView1.Columns[29].HeaderText = "30";
dataGridView1.Columns[30].HeaderText = "31";
return;
}
}

private void DisplayDays()
{
DateTime dt = new DateTime(displayedYear, displayedMonth, 1);
label1.Text = dt.ToString("MMMM yyyy"); // show month DGV is displaying in label, say
int daysInMonth = DateTime.DaysInMonth(dt.Year, dt.Month);
SetFinalDays(daysInMonth);
for (int i = 0; i < daysInMonth; i++)
{
dataGridView1.Rows[0].Cells[i].Value = dt.DayOfWeek.ToString().Substring(0, 1);
dt = dt.AddDays(1);
}

for (int i = daysInMonth; i < 31; i++) dataGridView1.Rows[0].Cells[i].Value = "";
}

private void currentMonth_Click(object sender, EventArgs e)
{
displayedMonth = DateTime.Today.Month;
displayedYear = DateTime.Today.Year;
DisplayDays();
}

private void lastmonth_Click(object sender, EventArgs e)
{
int month = displayedMonth - 1;
if (month == 0)
{
displayedMonth = 12;
displayedYear--;
}
else
{
displayedMonth--;
}
DisplayDays();
}

private void nextMonth_Click(object sender, EventArgs e)
{
int month = displayedMonth + 1;
if (month == 13)
{
displayedMonth = 1;
displayedYear++;
}
else
{
displayedMonth++;
}
DisplayDays();
}
}
0
Memento14y ago
for (int i = 1; i<1000; i++)
    {
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    }

itWorks.
0

c# winforms - how to populate DataGridViewRowHeaders and FirstRow - like a Calendar