在我的代码中,所有功能都能正常工作:保存按钮,更新和删除实际上可以正常工作,但是当我关闭程序并重新打开它时,所有更改都消失了。
因此,Save
按钮仅在我打开程序时有效;我希望当我更改任何内容时,它的代码也会更改。
顺便说一句,数据包含在DataGridView中。
Imports System.Data.DataTable
Public Class Form1
Dim table As New DataTable("Table")
Dim index As Integer
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
table.Columns.Add("ID", Type.GetType("System.Int32"))
table.Columns.Add("First Name", Type.GetType("System.String"))
table.Columns.Add("Last Name", Type.GetType("System.String"))
table.Columns.Add("Age", Type.GetType("System.Int32"))
table.Columns.Add("Programming", Type.GetType("System.Int32"))
table.Columns.Add("Law", Type.GetType("System.Int32"))
table.Columns.Add("English", Type.GetType("System.Int32"))
table.Columns.Add("GPA", Type.GetType("System.Int32"))
table.Columns.Add("Grade", Type.GetType("System.string"))
table.Rows.Add(1, "XXXX", "YYYYY", 21, 88, 77, 90, 89)
table.Rows.Add(2, "SSDD", "hGSQ", 33, 70, 96, 72, 82)
table.Rows.Add(3, "fgfgd", "jgfdd", 53)
table.Rows.Add(4, "cvfghyghj", "sdrgtyh", 19)
table.Rows.Add(5, "hghfd", "ghjgdf", 36)
table.Rows.Add(6, "cvvdfgh", "juyrfdvc", 63)
table.Rows.Add(7, "aefht", "cvfhytrff", 21)
table.Rows.Add(8, "wghyuj", "mihgdwrh", 33)
table.Rows.Add(9, "qsztii", "bvdhjh", 53)
table.Rows.Add(10, "rytyufd", "esdfzr", 19)
DataGridView1.DataSource = table
End Sub
Private Sub btnAdd_Click(sender As Object, e As EventArgs) Handles btnAdd.Click
Table.rows.Add(TextBoxID.Text, TextBoxFN.Text, TextBoxLN.Text, TextBoxAGE.Text)
DataGridView1.DataSource = table
End Sub
Private Sub TextBox4_TextChanged(sender As Object, e As EventArgs) Handles TextBoxAGE.TextChanged
End Sub
Private Sub DataGridView1_CellContentClick(sender As Object, e As DataGridViewCellEventArgs) Handles DataGridView1.CellContentClick, DataGridView1.CellClick
index = e.RowIndex
Dim selectedRow As DataGridViewRow
selectedRow = DataGridView1.Rows(index)
TextBoxID.Text = selectedRow.Cells(0).Value.ToString()
TextBoxFN.Text = selectedRow.Cells(1).Value.ToString()
TextBoxLN.Text = selectedRow.Cells(2).Value.ToString()
TextBoxAGE.Text = selectedRow.Cells(3).Value.ToString()
TextBoxPro.Text = selectedRow.Cells(4).Value.ToString()
TextBoxLaw.Text = selectedRow.Cells(5).Value.ToString()
TextBoxENGL.Text = selectedRow.Cells(6).Value.ToString()
TextBoxGPA.Text = selectedRow.Cells(7).Value.ToString()
TextBoxGrade.Text = selectedRow.Cells(8).Value.ToString()
End Sub
Private Sub btnUpdate_Click(sender As Object, e As EventArgs) Handles btnUpdate.Click
Dim newDataRow As DataGridViewRow
newDataRow = DataGridView1.Rows(index)
newDataRow.Cells(0).Value = TextBoxID.Text
newDataRow.Cells(1).Value = TextBoxFN.Text
newDataRow.Cells(2).Value = TextBoxLN.Text
newDataRow.Cells(3).Value = TextBoxAGE.Text
End Sub
Private Sub btnDelete_Click(sender As Object, e As EventArgs) Handles btnDelete.Click
DataGridView1.Rows.RemoveAt(index)
End Sub
End Class