DataGridView.RowCount 属性

参考

定义

命名空间:: System.Windows.Forms

程序集:: System.Windows.Forms.dll

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, set

Public Property RowCount As Integer

属性值

Int32

要在 DataGridView 中显示的行数。

属性: BrowsableAttribute

例外

ArgumentException

当设置此属性时，指定的值小于 0。

- 或 -

指定的值小于 1，并且 AllowUserToAddRows 设置为 true。

InvalidOperationException

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 == true)
            {

                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。

适用于

另请参阅

DataGridView 控件（Windows 窗体）

DataGridView.RowCount 属性

定义

属性值

例外

示例

注解

适用于

另请参阅

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