vb.net查询求和 vb求和代码
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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