我的图表从DataGridView加载数据。
如果将新值插入DataGridView，我想用新数据自动更新我的图表。
我的图表绑定到我的DataGridView中的table1和table2，它从DataTable获取值。以下是代码的一小部分：
Dim myData As New DataTable
wcAdapter.SelectCommand = wcCommand
wcAdapter.Fill(myData)
-
Chart1.DataSource = myData
Chart1.Series("Series1").ValueMemberX = "table1"
Chart1.Series("Series1").ValueMembersY = "table2"
以下是完整的代码：
Try
wcconn.Open()
Dim wcCommand As New MySqlCommand()
''telesales name
' Dim wcQuery = "SELECT ID, Telesales, SUBSTRING(lastupdatedate, 1, 10) as 'Day', SUBSTRING(lastupdatetime FROM -9 FOR 6) as 'Time' FROM ratingout where Telesales='" & cbTelesales.Text & "' and lastupdatedate= '" & newDate & "' and lastupdatedate is not null and lastupdatetime is not null ORDER BY lastupdatetime ;"
' wcCommand.Connection = wcconn
' wcCommand.CommandText = wcQuery
Dim newDate As String
newDate = dateWorkCheck.Text
newDate = newDate.Replace("/", "-")
Dim y, m, d As String
y = newDate.Substring(6, 4)
m = newDate.Substring(3, 2)
d = newDate.Substring(0, 2)
newDate = y & "-" & m & "-" & d
Dim wcQuery = "SELECT ID, Telesales, lastupdatedate as 'Day', SUBSTRING(lastupdatetime FROM -8 FOR 2) as 'Time' FROM ratingout where Telesales='" & cbTelesales.Text & "' and lastupdatedate= '" & newDate & "' and lastupdatedate is not null and lastupdatetime is not null ORDER BY lastupdatetime ;"
wcCommand.Connection = wcconn
wcCommand.CommandText = wcQuery
Dim wcData As New DataTable
wcAdapter.SelectCommand = wcCommand
wcAdapter.Fill(wcData)
Dim i = 0
If wcData.Rows.Count = 0 Then
wcAdapter.Dispose()
Try
Dim wQuery = "SELECT ID, Telesales, lastupdatedate as 'Day', SUBSTRING(lastupdatetime FROM -8 FOR 2) as 'Time' FROM ratingout where Telesales='" & cbTelesales.Text & "' and lastupdatedate= '" & dateWorkCheck.Text & "' and lastupdatedate is not null and lastupdatetime is not null ORDER BY lastupdatetime ;"
wcCommand.Connection = wcconn
wcCommand.CommandText = wQuery
Dim wData As New DataTable
wcAdapter.SelectCommand = wcCommand
wcAdapter.Fill(wData)
wData.Columns.Add("tt")
wData.Columns.Add("num")
wcData.Columns.Add("tt")
wcData.Columns.Add("num")
'dgvWorkCheck.AutoSizeRowsMode = DataGridViewAutoSizeRowMode.AllCells
Dim dr As DataRow
For Each dr In wData.Rows
If lastV Is Nothing OrElse Not ColumnEqual(lastV, dr("Time")) Then
''check if first value is nothing
If lastV = Nothing Then
lastV = "00"
l = "0"
Else
dr("tt") = lastV
dr("num") = l
'wcData.Tables("ratingout").Rows(I)("ID") = dr("ID")
End If
ListBox1.Items.Add(lastV & " <--> " & l)
lastV = dr("Time")
l = 1
ElseIf lastV Is Nothing OrElse ColumnEqual(lastV, dr("Time")) Then
l += 1
'Dim series1 As New Series()
'series1.Points.Add(l)
End If
For I = I To wData.Rows.Count
If I <> wData.Rows.Count Then
I += 1
If i = wData.Rows.Count Then
dr("tt") = lastV
dr("num") = l
ListBox1.BeginUpdate()
ListBox1.Items.Add(dr("Telesales") & " between[" & lastV & " and 17:00, ] <--> " & l & "[ records ]")
ListBox1.EndUpdate()
End If
GoTo n
Else
MsgBox("last data")
End If
Next
n:
Next
txtRec.Text = wData.Rows.Count
dgvWorkCheck.DataSource = wData
''chart
Dim ChartArea2 As ChartArea = New ChartArea()
Dim Legend2 As Legend = New Legend()
Dim Series2 As Series = New Series()
Dim Chart2 = New Chart()
Me.Controls.Add(Chart2)
ChartArea2.AxisX.LabelStyle.Angle = -90
ChartArea2.AxisX.LabelStyle.Interval = 1
ChartArea2.AxisY.LabelStyle.Angle = -90
ChartArea2.AxisY.LabelStyle.Interval = 5
ChartArea2.Name = "ChartArea2"
Chart2.ChartAreas.Add(ChartArea2)
Legend2.Name = "Legend2"
Chart2.Legends.Add(Legend2)
Chart2.Location = New System.Drawing.Point(12, 113)
Chart2.Name = "Chart2"
Series2.ChartArea = "ChartArea2"
Series2.Legend = "Legend2"
Series2.Name = "Series2"
Chart2.Series.Add(Series2)
Chart2.Size = New System.Drawing.Size(1145, 604)
Chart2.TabIndex = 0
Chart2.Text = "Chart2"
Chart2.Series("Series2").XValueMember = "tt"
Chart2.Series("Series2").YValueMembers = "num"
Chart2.DataSource = dgvWorkCheck.DataSource
Chart2.DataBind()
Catch ex As Exception
MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
End Try
Exit Try
答案 0 :(得分：0)
由于新数据已插入数据库，因此您只需将gridview重新绑定到其源，以显示新的传入数据。
您应该在函数中隔离将数据绑定到图表的代码，并在每次插入新字段时调用它：
Function FillChartWithData()
Dim myData As New DataTable
wcAdapter.SelectCommand = wcCommand
wcAdapter.Fill(myData)
...
Chart1.Series("Series1").ValueMemberX = "table1"
Chart1.Series("Series1").ValueMembersY = "table2"
End Function
修改
我看了你的编码，似乎你错过了负责在'ratingout'表中插入新数据的部分。您应该创建一个允许您插入新数据的函数，类似于以下内容：
Dim insertRating = "INSERT INTO ratingout VALUES (@NewTeleSalesName, @NewDate);"
Dim insertCmd As New MySqlCommand(insertRating, wcconn)
insertCmd.Parameters.Add("@NewTeleSalesName", MySqlDbType.VarChar, 255, "teleSalesName")
insertCmd.Parameters.Add("@NewDate", MySqlDbType.Datetime, 8, New DateTime(2010, 8, 5))
insertCmd.ExecuteNonQuery()
答案 1 :(得分：0)
为了更新名为bargraph的我的图表CashChart（数据绑定为BindingSource），我必须执行以下操作：
要清除图表信息，
清除边界源信息
然后重新分配边界源信息：例如：
CashChart.Series(0).Points.Clear()
CashChart.DataSource = ""
CashChart.DataSource = ESTADOINSTANTANEOBindingSource
之前，只有我的DataTable正在更新，但在这些命令之后，我能够使用表中的新值来更新bargraph。