c#如何在加载DataGridView时为自定义颜色组合框设置初始颜色，而不是只显示颜色的名称？
0
悬赏园豆：50
[待解决问题]
大家好，我有一个带有默认值的组合框。加载DataGridView时如何设置自定义颜色组合框的初始颜色，而不是只显示颜色的名称？有人知道吗？
code：
namespace Form1
{
public partial class Form1 : Form
{
private string xml =
@"<?xml version='1.0' standalone='yes'?>
<GenioCodes>
<Code No.='1' name='A' Colour='Blue' />
<Code No.='2' name='B' Colour='Green' />
<Code No.='3' name='C' Colour='Red' />
<Code No.='4' name='N' Colour='Black' />
</GenioCodes>";
DataSet m_dataSet = new DataSet();
public Form1()
{
InitializeComponent();
// reading xml from string
var reader = XmlReader.Create(new StringReader(xml));
m_dataSet.ReadXml(reader);
m_dataGridView.DataSource = m_dataSet.Tables[0];
var column = m_dataGridView.Columns["Colour"];
int idx = column.Index;
// removing text column
m_dataGridView.Columns.RemoveAt(idx);
// adding comboBox column
var cbo = new DataGridViewComboBoxColumn
{
Name = "color",
DataPropertyName = "Colour",
};
// unique color codes for comboBox
var colorCodes = m_dataSet.Tables[0].AsEnumerable()
.Select(r => r["Colour"])
.Distinct()
.ToList();
cbo.DataSource = colorCodes;
// restore column in orignal position
m_dataGridView.Columns.Insert(idx, cbo);
m_dataGridView.EditingControlShowing += ComboBoxShowing;
//disallow adding and deleting rows
m_dataGridView.AllowUserToAddRows = false;
m_dataGridView.AllowUserToDeleteRows = false;
}
/// <summary>
/// Activates custom drawing in comboBoxes
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void ComboBoxShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
{
if (e.Control is ComboBox theCB)
{
theCB.DrawMode = DrawMode.OwnerDrawFixed;
try
{
theCB.DrawItem -= new DrawItemEventHandler(this.ComboItemDraw);
}
catch { }
theCB.DrawItem += new DrawItemEventHandler(this.ComboItemDraw);
}
}
/// <summary>
/// Custom drawing for comboBox items
/// </summary>
private void ComboItemDraw(object sender, DrawItemEventArgs e)
{
Graphics g = e.Graphics;
Rectangle rDraw = e.Bounds;
rDraw.Inflate(-1, -1);
bool bSelected = Convert.ToBoolean(e.State & DrawItemState.Selected);
bool bValue = Convert.ToBoolean(e.State & DrawItemState.ComboBoxEdit);
rDraw = e.Bounds;
rDraw.Inflate(-1, -1);
if (bSelected & !bValue)
{
g.FillRectangle(Brushes.LightBlue, rDraw);
g.DrawRectangle(Pens.Blue, rDraw);
}
else
{
g.FillRectangle(Brushes.White, e.Bounds);
}
if (e.Index < 0)
return;
string code = ((ComboBox)sender).Items[e.Index].ToString();
Color c = GetColorFromCode(code);
string s = c.ToString();
SolidBrush b = new SolidBrush(c);
Rectangle r = new Rectangle(e.Bounds.Left, e.Bounds.Top, e.Bounds.Width, e.Bounds.Height);
g.FillRectangle(b, r);
g.DrawRectangle(Pens.Black, r);
//g.DrawString(s, Form.DefaultFont, Brushes.Black, e.Bounds.Left + 25, e.Bounds.Top + 1);
b.Dispose();
}
/// <summary>
/// Returns color for a given code
/// </summary>
/// <param name="code"></param>
/// <returns></returns>
private Color GetColorFromCode(string code)
{
switch (code)
{
case "Blue": return Color.Blue;
case "Green": return Color.Green;
case "Red": return Color.Red;
case "Black": return Color.Black;
}
return Color.Red;
}
int index;
private void m_dataGridView_CellEnter(object sender, DataGridViewCellEventArgs e)
{
index = e.RowIndex;
//实现单击一次显示下拉列表框
if (m_dataGridView.Columns[e.ColumnIndex] is DataGridViewComboBoxColumn && e.RowIndex != -1)
{
SendKeys.Send("{F4}");
}
}
}
}
所有回答(2)
0
详细代码在这篇文章里：https://www.cnblogs.com/HelloQLQ/p/15754917.html
datagridview 注册CellPainting事件，里面的代码如下：
private void m_dataGridView_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
{
var a = e.Value;
if (a != null && LstColors.Contains(a))
{
var color = GetColorFromCode(a.ToString());
var g = e.Graphics;
Brush b=new SolidBrush(color);
var rec = e.CellBounds;
rec.X += 2;
rec.Y += 2;
rec.Width -= 20;
rec.Height -= 10;
e.PaintContent(rec);
g.FillRectangle(b, rec);
e.Handled = true;
}
}
0
设置单元格的背景色为单元格值
