我已经将数据从数据库加载到datagridview，并且有两列目标值和体积，其中体积>目标值，体积单元格应为绿色，体积<目标值，然后体积应为红色。我试过了，但我做不到。
private void dataGridView1_DataBindingComplete(object sender, DataGridViewBindingCompleteEventArgs e)
{
if (dataGridView1.Rows.Count > 0 && dataGridView1.Columns.Count > 0)
{
foreach (DataGridViewRow r in dataGridView1.Rows)
{
if (Volume > target value)
{
cell.Style.BackColor = Color.AliceBlue;
}
我可能建议不要在每次调用 CellFormating 时遍历每一行，因为每次需要刷新单行时都会调用它。
Private Sub dgv_DisplayData_Vertical_CellFormatting(sender As Object, e As DataGridViewCellFormattingEventArgs) Handles dgv_DisplayData_Vertical.CellFormatting
Try
If dgv_DisplayData_Vertical.Rows(e.RowIndex).Cells("LevelID").Value.ToString() = "6" Then
e.CellStyle.BackColor = Color.DimGray
End If
If dgv_DisplayData_Vertical.Rows(e.RowIndex).Cells("LevelID").Value.ToString() = "5" Then
e.CellStyle.BackColor = Color.DarkSlateGray
End If
If dgv_DisplayData_Vertical.Rows(e.RowIndex).Cells("LevelID").Value.ToString() = "4" Then
e.CellStyle.BackColor = Color.SlateGray
End If
If dgv_DisplayData_Vertical.Rows(e.RowIndex).Cells("LevelID").Value.ToString() = "3" Then
e.CellStyle.BackColor = Color.LightGray
End If
If dgv_DisplayData_Vertical.Rows(e.RowIndex).Cells("LevelID").Value.ToString() = "0" Then
e.CellStyle.BackColor = Color.White
End If
Catch ex As Exception
End Try
End Sub
你需要这样做
private void dataGridView1_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{
foreach (DataGridViewRow Myrow in dataGridView1.Rows)
{ //Here 2 cell is target value and 1 cell is Volume
if (Convert.ToInt32(Myrow .Cells[2].Value)<Convert.ToInt32(Myrow .Cells[1].Value))// Or your condition
{
Myrow .DefaultCellStyle.BackColor = Color.Red;
}
else
{
Myrow .DefaultCellStyle.BackColor = Color.Green;
}
}
}
同时也看看Cell Formatting
Kyle 和 Simon 的回答是对 CPU 资源的严重浪费。CellFormatting和CellPainting事件发生太多次，不应该用于应用样式。这里有两种更好的方法：
如果您的 DataGridView 或至少决定单元格样式的列是只读的，则应更改RowsAdded事件中行的 DefaultCellStyle。此事件仅在添加新行时发生一次。条件应该在那个时候被评估，并且DefaultCellStyle应该在其中设置行的。请注意，此事件也会在 DataBound 情况下发生。
如果您的 DataGridView 或那些列允许编辑，您应该使用CellEndEdit或CommitEdit事件来更改DefaultCellStyle.
假设您必须通过了解两件事来为某个单元格（不是该行的所有单元格）着色：
在这种情况下，您必须使用事件CellFormatting
就我而言，我这样使用
private void DgvTrucksMaster_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{
foreach (DataGridViewRow row in dgvTrucksMaster.Rows)
{
if (Convert.ToInt32(row.Cells["Decade1Hours"].Value) > 0)
{
row.Cells["Decade1Hours"].Style.BackColor = Color.LightGreen;
}
else if (Convert.ToInt32(row.Cells["Decade1Hours"].Value) < 0)
{
// row.DefaultCellStyle.BackColor = Color.LightSalmon; // Use it in order to colorize all cells of the row
row.Cells["Decade1Hours"].Style.BackColor = Color.LightSalmon;
}
}
}
结果你可以在这里看到
因此，在这里您可以通过名称 row.Cells["Decade1Hours"] 访问列中行的某些单元格
你怎么知道这个名字？好吧，在我的情况下，我像这样创建 DataGridView 列。
var Decade1Hours = new DataGridViewTextBoxColumn()
{
Name = "Decade1Hours",
Width = 50,
DataPropertyName = "Decade1Hours",
ReadOnly = true,
DefaultCellStyle = new DataGridViewCellStyle()
{
Alignment = DataGridViewContentAlignment.MiddleCenter,
ForeColor = System.Drawing.Color.Black,
Font = new Font(font, FontStyle.Bold),
Format = "n2"
},
HeaderCell = new DataGridViewColumnHeaderCell()
{
Style = new DataGridViewCellStyle()
{
Alignment = DataGridViewContentAlignment.MiddleCenter,
BackColor = System.Drawing.Color.Blue
}
}
};
Decade1Hours.HeaderText = "Дек.1";
dgvTrucksMaster.Columns.Add(Decade1Hours);
好吧...您需要例如为行中的某些单元格着色，例如 ##1 4 5 和 8 您必须使用单元格索引（它从 0 开始）。
代码看起来像
private void DgvTrucksMaster_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{
foreach (DataGridViewRow row in dgvTrucksMaster.Rows)
{
if (Convert.ToInt32(row.Cells[1].Value) > 0 )
{
row.Cells[1].Style.BackColor = Color.LightGreen;
}
}
}
foreach (DataGridViewRow row in dgvWebData.Rows)
{
if (Convert.ToString(row.Cells["IssuerName"].Value) != Convert.ToString(row.Cells["SearchTermUsed"].Value))
{
row.DefaultCellStyle.BackColor = Color.Yellow;
}
else
{
row.DefaultCellStyle.BackColor = Color.White;
}
}
这对我来说非常有用。即使更改了一行，也会处理相同的事件。
没有循环它可以像下面那样实现。
private void dgEvents_RowPrePaint(object sender, DataGridViewRowPrePaintEventArgs e)
{
FormatRow(dgEvents.Rows[e.RowIndex]);
}
private void FormatRow(DataGridViewRow myrow)
{
try
{
if (Convert.ToString(myrow.Cells["LevelDisplayName"].Value) == "Error")
{
myrow.DefaultCellStyle.BackColor = Color.Red;
}
else if (Convert.ToString(myrow.Cells["LevelDisplayName"].Value) == "Warning")
{
myrow.DefaultCellStyle.BackColor = Color.Yellow;
}
else if (Convert.ToString(myrow.Cells["LevelDisplayName"].Value) == "Information")
{
myrow.DefaultCellStyle.BackColor = Color.LightGreen;
}
}
catch (Exception exception)
{
onLogs?.Invoke(exception.Message, EventArgs.Empty);
}
}
private void dataGridView1_DataBindingComplete(object sender DataGridViewBindingCompleteEventArgs e)
{
foreach (DataGridViewRow row in dataGridView1.Rows)
{
if (Convert.ToInt32(row.Cells["balaceAmount"].Value) == 0)
{
row.DefaultCellStyle.BackColor = Color.Yellow;
}
else
{
row.DefaultCellStyle.BackColor = Color.White;
}
}
}
private void dataMain_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{
if (dataMain.Columns[e.ColumnIndex].Name == "colStatus")
{
if (int.Parse(e.Value.ToString()) == 2)
{
dataMain.Rows[e.RowIndex].DefaultCellStyle.BackColor = Color.OrangeRed;
dataMain.Rows[e.RowIndex].DefaultCellStyle.ForeColor = Color.White;
}
}
}
自从我实际上在 SO 上发布了一些东西以来已经有一段时间了，但我们开始吧。
使用 _RowsAddedEvent 将自定义样式应用于您的网格单元格，其他所有内容都会占用过多的 CPU。如果你最近问这个问题，cpu 周期对你来说很重要。
因此，下面是根据底层数据绑定项的值绘制单元格的代码。
private void grid_RowsAdded(object sender, DataGridViewRowsAddedEventArgs e)
{
for ( int i = e.RowIndex; i <= e.RowIndex + e.RowCount - 1; i++)
{
var row = grid.Rows[i];
var item = row.DataBoundItem as MovieViewerDataItem;
if (item == null) continue;
var cell = row.Cells["FullPath"];
if ( item.FullPath.StartsWith("u:", StringComparison.InvariantCultureIgnoreCase))
{
cell.Style.BackColor = System.Drawing.ColorTranslator.FromHtml("#FFF2CC");
}
else if( item.FullPath.StartsWith("m:", StringComparison.InvariantCultureIgnoreCase))
{
cell.Style.BackColor = System.Drawing.ColorTranslator.FromHtml("#E2EFDA");
}
}
}
令人惊讶的是，没有人提到一个简单的if语句可以确保您的循环仅在每种格式中执行一次（在第一列的第一行）。
private void dgv_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{
// once per format
if (e.ColumnIndex == 0 && e.RowIndex == 0)
{
foreach (DataGridViewRow row in dgv.Rows)
if (row != null)
row.DefaultCellStyle.BackColor = Color.Red;
}
}
我知道这是一篇旧帖子，但我在 2018 年找到了我的方式，所以也许其他人也会。在我看来，OP 比提供的任何答案都有更好的方法（使用 dgv_DataBindingComplete 事件）。在撰写本文时，所有答案都是使用绘制事件或单元格格式化事件编写的，这似乎效率低下。
OP 已经完成了 99%，他们所要做的就是遍历他们的行，测试每一行的单元格值，并设置 BackColor、ForeColor 或您想要设置的任何其他属性。
请原谅 vb.NET 语法，但我认为它与 C# 足够接近，应该很清楚。
Private Sub dgvFinancialResults_DataBindingComplete Handles dgvFinancialResults.DataBindingComplete
Try
Logging.TraceIt()
For Each row As DataGridViewRow in dgvFinancialResults.Rows
Dim invoicePricePercentChange = CSng(row.Cells("Invoice Price % Change").Value)
Dim netPricePercentChange = CSng(row.Cells("Net Price % Change").Value)
Dim tradespendPricePercentChange = CSng(row.Cells("Trade Spend % Change").Value)
Dim dnnsiPercentChange = CSng(row.Cells("DNNSI % Change").Value)
Dim cogsPercentChange = CSng(row.Cells("COGS % Change").Value)
Dim grossProfitPercentChange = CSng(row.Cells("Gross Profit % Change").Value)
If invoicePricePercentChange > Single.Epsilon Then
row.Cells("Invoice Price % Change").Style.ForeColor = Color.Green
Else
row.Cells("Invoice Price % Change").Style.ForeColor = Color.Red
End If
If netPricePercentChange > Single.Epsilon Then
row.Cells("Net Price % Change").Style.ForeColor = Color.Green
Else
row.Cells("Net Price % Change").Style.ForeColor = Color.Red
End If
If tradespendPricePercentChange > Single.Epsilon Then
row.Cells("Trade Spend % Change").Style.ForeColor = Color.Green
Else
row.Cells("Trade Spend % Change").Style.ForeColor = Color.Red
End If
If dnnsiPercentChange > Single.Epsilon Then
row.Cells("DNNSI % Change").Style.ForeColor = Color.Green
Else
row.Cells("DNNSI % Change").Style.ForeColor = Color.Red
End If
If cogsPercentChange > Single.Epsilon Then
row.Cells("COGS % Change").Style.ForeColor = Color.Green
Else
row.Cells("COGS % Change").Style.ForeColor = Color.Red
End If
If grossProfitPercentChange > Single.Epsilon Then
row.Cells("Gross Profit % Change").Style.ForeColor = Color.Green
Else
row.Cells("Gross Profit % Change").Style.ForeColor = Color.Red
End If
Next
Catch ex As Exception
Logging.ErrorHandler(ex)
End Try
End Sub
//After Done Binding DataGridView Data
foreach(DataGridViewRow DGVR in DGV_DETAILED_DEF.Rows)
{
if(DGVR.Index != -1)
{
if(DGVR.Cells[0].Value.ToString() == "البدلات")
{
CurrRType = "البدلات";
DataGridViewCellStyle CS = DGVR.DefaultCellStyle;
CS.BackColor = Color.FromArgb(0,175,100);
CS.ForeColor = Color.FromArgb(0,32,15);
CS.Font = new Font("Times New Roman",12,FontStyle.Bold);
CS.SelectionBackColor = Color.FromArgb(0,175,100);
CS.SelectionForeColor = Color.FromArgb(0,32,15);
DataGridViewCellStyle LCS = DGVR.Cells[DGVR.Cells.Count - 1].Style;
LCS.BackColor = Color.FromArgb(50,50,50);
LCS.SelectionBackColor = Color.FromArgb(50,50,50);
}
else if(DGVR.Cells[0].Value.ToString() == "الإستقطاعات")
{
CurrRType = "الإستقطاعات";
DataGridViewCellStyle CS = DGVR.DefaultCellStyle;
CS.BackColor = Color.FromArgb(175,0,50);
CS.ForeColor = Color.FromArgb(32,0,0);
CS.Font = new Font("Times New Roman",12,FontStyle.Bold);
CS.SelectionBackColor = Color.FromArgb(175,0,50);
CS.SelectionForeColor = Color.FromArgb(32,0,0);
DataGridViewCellStyle LCS = DGVR.Cells[DGVR.Cells.Count - 1].Style;
LCS.BackColor = Color.FromArgb(50,50,50);
LCS.SelectionBackColor = Color.FromArgb(50,50,50);
}
}
}
让它简单
private void dataGridView1_cellformatting(object sender,DataGridViewCellFormattingEventArgs e)
{
var amount = (int)e.Value;
// return if rowCount = 0
if (this.dataGridView1.Rows.Count == 0)
return;
if (amount > 0)
e.CellStyle.BackColor = Color.Green;
else
e.CellStyle.BackColor = Color.Red;
}
看看单元格格式