DataGridView.RowCount 属性
定义
重要
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获取或设置 DataGridView 中显示的行数。
public:
property int RowCount { int get(); void set(int value); };[System.ComponentModel.Browsable(false)]
public int RowCount { get; set; }[<System.ComponentModel.Browsable(false)>]
member this.RowCount : int with get, setPublic Property RowCount As Integer属性值
要在 DataGridView 中显示的行数。
- 属性
例外
设置此属性的同时设置了 DataSource 属性。
示例
下面的代码示例演示如何使用 RowCount 属性。 在此示例中，此属性用于跟踪 中的 DataGridView条目数。 此示例是 事件中提供的更大示例的 SelectionChanged 一部分。
private void UpdateLabelText()
{
int WithdrawalTotal = 0;
int DepositTotal = 0;
int SelectedCellTotal = 0;
int counter;
// Iterate through all the rows and sum up the appropriate columns.
for (counter = 0; counter < (DataGridView1.Rows.Count);
counter++)
{
if (DataGridView1.Rows[counter].Cells["Withdrawals"].Value
!= null)
{
if (DataGridView1.Rows[counter].
Cells["Withdrawals"].Value.ToString().Length != 0)
{
WithdrawalTotal += int.Parse(DataGridView1.Rows[counter].
Cells["Withdrawals"].Value.ToString());
}
}
if (DataGridView1.Rows[counter].Cells["Deposits"].Value != null)
{
if (DataGridView1.Rows[counter]
.Cells["Deposits"].Value.ToString().Length != 0)
{
DepositTotal += int.Parse(DataGridView1.Rows[counter]
.Cells["Deposits"].Value.ToString());
}
}
}
// Iterate through the SelectedCells collection and sum up the values.
for (counter = 0;
counter < (DataGridView1.SelectedCells.Count); counter++)
{
if (DataGridView1.SelectedCells[counter].FormattedValueType ==
Type.GetType("System.String"))
{
string value = null;
// If the cell contains a value that has not been commited,
// use the modified value.
if (DataGridView1.IsCurrentCellDirty)
{
value = DataGridView1.SelectedCells[counter]
.EditedFormattedValue.ToString();
}
else
{
value = DataGridView1.SelectedCells[counter]
.FormattedValue.ToString();
}
if (value != null)
{
// Ignore cells in the Description column.
if (DataGridView1.SelectedCells[counter].ColumnIndex !=
DataGridView1.Columns["Description"].Index)
{
if (value.Length != 0)
{
SelectedCellTotal += int.Parse(value);
}
}
}
}
}
// Set the labels to reflect the current state of the DataGridView.
Label1.Text = "Withdrawals Total: " + WithdrawalTotal.ToString();
Label2.Text = "Deposits Total: " + DepositTotal.ToString();
Label3.Text = "Selected Cells Total: " + SelectedCellTotal.ToString();
Label4.Text = "Total entries: " + DataGridView1.RowCount.ToString();
}
Private Sub UpdateLabelText()
Dim WithdrawalTotal As Integer = 0
Dim DepositTotal As Integer = 0
Dim SelectedCellTotal As Integer = 0
Dim counter As Integer
' Iterate through all the rows and sum up the appropriate columns.
For counter = 0 To (DataGridView1.Rows.Count - 1)
If Not DataGridView1.Rows(counter) _
.Cells("Withdrawals").Value Is Nothing Then
If Not DataGridView1.Rows(counter) _
.Cells("Withdrawals").Value.ToString().Length = 0 Then
WithdrawalTotal += _
Integer.Parse(DataGridView1.Rows(counter) _
.Cells("Withdrawals").Value.ToString())
End If
End If
If Not DataGridView1.Rows(counter) _
.Cells("Deposits").Value Is Nothing Then
If Not DataGridView1.Rows(counter) _
.Cells("Deposits").Value.ToString().Length = 0 Then
DepositTotal += _
Integer.Parse(DataGridView1.Rows(counter) _
.Cells("Deposits").Value.ToString())
End If
End If
Next
' Iterate through the SelectedCells collection and sum up the values.
For counter = 0 To (DataGridView1.SelectedCells.Count - 1)
If DataGridView1.SelectedCells(counter).FormattedValueType Is _
Type.GetType("System.String") Then
Dim value As String = Nothing
' If the cell contains a value that has not been commited,
' use the modified value.
If (DataGridView1.IsCurrentCellDirty = True) Then
value = DataGridView1.SelectedCells(counter) _
.EditedFormattedValue.ToString()
Else
value = DataGridView1.SelectedCells(counter) _
.FormattedValue.ToString()
End If
If value IsNot Nothing Then
' Ignore cells in the Description column.
If Not DataGridView1.SelectedCells(counter).ColumnIndex = _
DataGridView1.Columns("Description").Index Then
If Not value.Length = 0 Then
SelectedCellTotal += Integer.Parse(value)
End If
End If
End If
End If
Next
' Set the labels to reflect the current state of the DataGridView.
Label1.Text = "Withdrawals Total: " & WithdrawalTotal.ToString()
Label2.Text = "Deposits Total: " & DepositTotal.ToString()
Label3.Text = "Selected Cells Total: " & SelectedCellTotal.ToString()
Label4.Text = "Total entries: " & DataGridView1.RowCount.ToString()
End Sub
注解
如果 RowCount 设置为小于当前值的值，则将从集合末尾 Rows 删除行。 如果 RowCount 设置为大于当前值的值，则会将行添加到集合的 Rows 末尾。 其他行基于 属性中指定的 RowTemplate 行。
如果将 属性设置为 RowCount 0，则将从 DataGridView中删除所有行。 这等效于调用 DataGridViewRowCollection.Clear 方法。
注意
如果 AllowUserToAddRows 为 true，则不能将 设置为 RowCount 0。 在这种情况下，调用 DataGridViewRowCollection.Clear 方法以删除除新记录的行以外的所有行。 在这种情况下，调用 Clear 与将 设置为 RowCount 1 的结果相同，但速度要快得多。
属性 RowCount 可与 属性一起使用， ColumnCount 以创建用于显示和编辑文本的简单 DataGridView 。 如果为DataGridView不带列的RowCount控件将 属性设置为大于 0 的值，DataGridViewTextBoxColumn则会自动添加 。
