根据条件更改datagridview单元格颜色
我已经将数据从数据库加载到datagridview并且具有两列目标值和体积，其中体积＆gt;目标值，体积单元应该是绿色并且体积<1。目标值然后体积应为红色。我尝试了但是我无法做到。
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;
}
12 个答案:
答案 0 :(得分：19)
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;
}
}
}
同时还要看看Cell Formatting
答案 1 :(得分：19)
我可能会建议 NOT 循环遍历每一行每次调用CellFormating时，因为每次需要刷新一行时都会调用它。
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
答案 2 :(得分：17)
凯尔和西蒙的答案是对CPU资源的严重浪费。 CellFormatting和CellPainting事件发生的次数太多，不应用于应用样式。以下是两种更好的方法：
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。添加新行时，此事件仅发生一次。应该在那时评估条件，并且应该在其中设置行的DefaultCellStyle。请注意，DataBound情况也会发生此事件。
如果您的DataGridView或这些列允许修改，您应该使用CellEndEdit或CommitEdit个事件来更改DefaultCellStyle。
答案 3 :(得分：3)
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。即使一行被更改，同样的事件也会照顾。
答案 4 :(得分：1)
让我们说你必须通过了解两件事来为某些细胞（不是该行的所有细胞）着色：
- 列的名称或索引。
- 将在单元格内部的值。
在这种情况下，您必须使用事件CellFormatting
在我的情况下，我像这样使用
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
所以在这里你可以按名称访问列中行的某个单元格 row.Cells [＆＃34; Decade1Hours＆＃34;]
你怎么知道这个名字？ 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);
嗯......你需要为行中的一些单元格着色，如## 1 4 5和8，你必须使用单元格索引（它从0开始）。
代码会像
一样 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;
}
}
}
答案 5 :(得分：1)
无需循环即可实现，如下所示。
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);
}
}
答案 6 :(得分：1)
<!DOCTYPE html>
<html>
<head>
<title>Object reference not set to an instance of an object.</title>
<meta name="viewport" content="width=device-width" />
<style>
body {font-family:"Verdana";font-weight:normal;font-size: .7em;color:black;}
p {font-family:"Verdana";font-weight:normal;color:black;margin-top: -5px}
b {font-family:"Verdana";font-weight:bold;color:black;margin-top: -5px}
H1 { font-family:"Verdana";font-weight:normal;font-size:18pt;color:red }
H2 { font-family:"Verdana";font-weight:normal;font-size:14pt;color:maroon }
pre {font-family:"Consolas","Lucida Console",Monospace;font-size:11pt;margin:0;padding:0.5em;line-height:14pt}
.marker {font-weight: bold; color: black;text-decoration: none;}
.version {color: gray;}
.error {margin-bottom: 10px;}
.expandable { text-decoration:underline; font-weight:bold; color:navy; cursor:hand; }
@media screen and (max-width: 639px) {
pre { width: 440px; overflow: auto; white-space: pre-wrap; word-wrap: break-word; }
}
@media screen and (max-width: 479px) {
pre { width: 280px; }
}
</style>
</head>
<body bgcolor="white">
<span><H1>Server Error in '/' Application.<hr width=100% size=1 color=silver></H1>
<h2> <i>Object reference not set to an instance of an object.</i> </h2></span>
<font face="Arial, Helvetica, Geneva, SunSans-Regular, sans-serif ">
<b> Description: </b>An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
<br><br>
<b> Exception Details: </b>System.NullReferenceException: Object reference not set to an instance of an object.<br><br>
<b>Source Error:</b> <br><br>
<table width=100% bgcolor="#ffffcc">
<tr>
<td>
<code>
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.</code>
</td>
</tr>
</table>
<br>
<b>Stack Trace:</b> <br><br>
<table width=100% bgcolor="#ffffcc">
<tr>
<td>
<code><pre>
[NullReferenceException: Object reference not set to an instance of an object.]
IS_ERSB.Controllers.DebtorsController.GetDebtors(PublicDebtorsPagingViewModel model) in D:\work\dev\is_ersb\IS_ERSB\Controllers\DebtorsController.cs:139
lambda_method(Closure , ControllerBase , Object[] ) +126
System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +241
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +38
System.Web.Mvc.Async.AsyncControllerActionInvoker.<BeginInvokeSynchronousActionMethod>b__39(IAsyncResult asyncResult, ActionInvocation innerInvokeState) +11
System.Web.Mvc.Async.WrappedAsyncResult`2.CallEndDelegate(IAsyncResult asyncResult) +138
System.Web.Mvc.Async.AsyncInvocationWithFilters.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3d() +111
System.Web.Mvc.Async.<>c__DisplayClass46.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3f() +452
System.Web.Mvc.Async.<>c__DisplayClass46.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3f() +452
System.Web.Mvc.Async.<>c__DisplayClass33.<BeginInvokeActionMethodWithFilters>b__32(IAsyncResult asyncResult) +15
System.Web.Mvc.Async.<>c__DisplayClass2b.<BeginInvokeAction>b__1c() +37
System.Web.Mvc.Async.<>c__DisplayClass21.<BeginInvokeAction>b__1e(IAsyncResult asyncResult) +241
System.Web.Mvc.Controller.<BeginExecuteCore>b__1d(IAsyncResult asyncResult, ExecuteCoreState innerState) +29
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +111
System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +53
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +19
System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__5(IAsyncResult asyncResult, ProcessRequestState innerState) +51
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +111
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +606
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +288
</pre></code>
</td>
</tr>
</table>
<br>
<hr width=100% size=1 color=silver>
<b>Version Information:</b> Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.18408
</font>
</body>
</html>
<!--
[NullReferenceException]: Object reference not set to an instance of an object.
at IS_ERSB.Controllers.DebtorsController.GetDebtors(PublicDebtorsPagingViewModel model) in D:\work\dev\is_ersb\IS_ERSB\Controllers\DebtorsController.cs:line 139
at lambda_method(Closure , ControllerBase , Object[] )
at System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters)
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters)
at System.Web.Mvc.Async.AsyncControllerActionInvoker.<BeginInvokeSynchronousActionMethod>b__39(IAsyncResult asyncResult, ActionInvocation innerInvokeState)
at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`2.CallEndDelegate(IAsyncResult asyncResult)
at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3d()
at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>c__DisplayClass46.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3f()
at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>c__DisplayClass46.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3f()
at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass33.<BeginInvokeActionMethodWithFilters>b__32(IAsyncResult asyncResult)
at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass21.<>c__DisplayClass2b.<BeginInvokeAction>b__1c()
at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass21.<BeginInvokeAction>b__1e(IAsyncResult asyncResult)
at System.Web.Mvc.Controller.<BeginExecuteCore>b__1d(IAsyncResult asyncResult, ExecuteCoreState innerState)
at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult)
at System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult)
at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult)
at System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__5(IAsyncResult asyncResult, ProcessRequestState innerState)
at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult)
at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
--><!--
This error page might contain sensitive information because ASP.NET is configured to show verbose error messages using <customErrors mode="Off"/>. Consider using <customErrors mode="On"/> or <customErrors mode="RemoteOnly"/> in production environments.-->
答案 7 :(得分：0)
惊讶没有人提到一个简单的ImageButton imageButton = (ImageButton)getView().findViewById( R.id.ib);
语句可以确保你的循环每个格式只执行一次（在第一行的第一列）。
v答案 8 :(得分：0)
我知道这是一篇旧文章，但是我在2018年找到了自己的出路，所以也许其他人也会这样做。我认为，与提供的任何答案相比，OP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画事件或单元格格式化事件来编写的，这似乎效率很低。
操作是完成操作的99％，他们要做的就是遍历行，测试每行的单元格值，并设置BackColor，ForeColor或要设置的任何其他属性。
请原谅vb.NET语法，但我认为它与C＃的距离足够近，因此应该清楚。
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
答案 9 :(得分：0)
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;
}
}
}
答案 10 :(得分：-1)
//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);
}
}
}
答案 11 :(得分：-1)
简单明了
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;
}
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