VB.net中的求和问题

Private Sub Command1_Click()

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MsgBox CalcResult(2)

End Sub

Public Function CalcResult(X As Long) As Double

Dim dblMinLevel As Double

Dim dblItem As Double

Dim dblN As Double

Dim dblMember As Double, dblBase As Double

Dim i As Double

Dim dblResult As Double

dblMinLevel = 10 ^ (-6)

dblN = 0

Do

dblMember = X ^ dblN

dblBase = 1

i = dblN

Do While i 1

dblBase = dblBase * i

i = i - 1

Loop

dblItem = dblMember / dblBase

dblResult = dblResult + dblItem

dblN = dblN + 1

Loop While dblItem = dblMinLevel

CalcResult = dblResult

End Function

VB.net中 datagridview控件如何读取框选区域内的行数和区域内的数据总和

在窗体上加上三个标签控件：Label1、Label2、Label3

Private Sub DataGridView1_MouseUp(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles DataGridView1.MouseUp

Dim counter As Integer

Dim SelectedCellTotal As Integer = 0

Dim SelectedCellCount As Integer = 0

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 (DataGridView1.IsCurrentCellDirty = True) Then

value = DataGridView1.SelectedCells(counter).EditedFormattedValue.ToString()

Else

value = DataGridView1.SelectedCells(counter).FormattedValue.ToString()

End If

If value IsNot Nothing Then

If Not value.Length = 0 Then

SelectedCellTotal = SelectedCellTotal + Integer.Parse(value)

SelectedCellCount = SelectedCellCount + 1

End If

End If

End If

Next

Label1.Text = "选中的单元格个数为: "  SelectedCellCount.ToString()

Label2.Text = "单元格里数据之和为: "  SelectedCellTotal.ToString()

Label3.Text = "选中的单元格行数为："  DataGridView1.SelectedRows.Count.ToString()

End Sub

VB.NET条件查询ACCESS并求和怎么写代码？

因为你要计算和，所以在查询的时候把排序的查询参数去掉了

Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load

Dim conn As New OleDb.OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=F:\project\office\test.accdb")

Dim cmd As New OleDb.OleDbCommand("select sum(金额) as m from shop where 时间='15-12-1' And 名字 = '张三' ", conn)

Dim adp As New OleDb.OleDbDataAdapter(cmd)

conn.Open()

Dim tb As New DataTable

adp.Fill(tb)

TextBox1.Text = tb.Rows(0).Item(0).ToString()

End Sub

VB.NET 中datagrid一列怎么求和

Dim textColumn As New DataGridViewTextBoxColumn() '定义一个新的textbox格式的列

textColumn.Name = "Column1" '定义该列的Name

textColumn.HeaderText = "Column1" '定义该列的标题

DataGridView1.Columns.Add(textColumn)

For Each r As DataGridViewRow In DataGridView1.Rows '循环DataGridView的行

r.Cells(textColumn.Index).Value = r.Cells(0).Value + r.Cells(1).Value '将第一列和第二列单元格数据相加，并显示在新添加的单元格上

Next

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