根据来自定界文本文件的数据 table 在 datagridview 中显示图像

Question

数据 table 和数据网格视图方面的新手。有一个带分隔符的文本文件，示例行如下：

;AnalogueJoystick_1;LStick;C:\Users\Steve\Scripts\Projects\CPWizBiz\Code\CPWizBizW\Assets\Images\System_Controller_Components\Sony PSX\LStick #4.png;Steer;LStick;
KEYCODE_A;Button_01;Triangle;;Left Airbrake;Cross;View
KEYCODE_C;Button_03;Square;C:\Users\Steve\Scripts\Projects\CPWizBiz\Code\CPWizBizW\Assets\Images\System_Controller_Components\Sony PSX\Square.png;Ditch Weapon;Square;

请注意中间 'row' 图像 'cell' 为空。

也有此代码导入 .txt 文件，转换为数据 table，然后到数据网格视图：

Private Sub LoadCSV(CSVFile As String)
    Dim TextFileReader As New Microsoft.VisualBasic.FileIO.TextFieldParser(CSVFile)
    TextFileReader.TextFieldType = FileIO.FieldType.Delimited
    TextFileReader.SetDelimiters(";")
    Dim TextFileTable As DataTable = Nothing
    Dim Column As DataColumn
    Dim Row As DataRow
    Dim UpperBound As Int32
    Dim ColumnCount As Int32
    Dim CurrentRow As String()

    While Not TextFileReader.EndOfData
        Try
            CurrentRow = TextFileReader.ReadFields()
            If Not CurrentRow Is Nothing Then
                ''# Check if DataTable has been created
                If TextFileTable Is Nothing Then
                    TextFileTable = New DataTable("TextFileTable")
                    ''# Get number of columns
                    UpperBound = CurrentRow.GetUpperBound(0)
                    ''# Create new DataTable
                    For ColumnCount = 0 To UpperBound
                        Column = New DataColumn()
                        Column.DataType = System.Type.GetType("System.String")
                        Column.ColumnName = "Column" & ColumnCount
                        Column.Caption = "Column" & ColumnCount
                        Column.ReadOnly = True
                        Column.Unique = False
                            TextFileTable.Columns.Add(Column)
                    Next
                End If
                Row = TextFileTable.NewRow
                For ColumnCount = 0 To UpperBound
                    Row("Column" & ColumnCount) = CurrentRow(ColumnCount).ToString
                Next
                TextFileTable.Rows.Add(Row)
            End If
        Catch ex As  _
        Microsoft.VisualBasic.FileIO.MalformedLineException
            MsgBox("Line " & ex.Message & _
            "is not valid and will be skipped.")
        End Try
    End While
    TextFileReader.Dispose()
    DataGridView1.DataSource = TextFileTable
End Sub

我正在努力使第 3 列（图像文件列）在 datagridview 中显示为实际图像。此外，需要能够处理空值。

其次，我希望能够将列从 "Column0" "coulmn1" 等重命名为我选择的 headers（例如 "Input Control" "Controller Function"等....

有人可以指教吗？谢谢

Answer 1

如果您希望 DataGridViewImageColumn 显示来自绑定 DataTable 的图像，那么 table 必须在绑定 DataColumn 中包含 Byte 数组。如果您想从图像文件中获取 Byte 数组，则可以调用 File.ReadAllBytes.

至于headers列，您必须在绑定后手动设置。可以循环遍历grid的Columnscollection，设置每列的HeaderText

Answer 2

同船之人的最终代码：

Private Sub LoadCSV(CSVFile As String)
        Dim TextFileReader As New Microsoft.VisualBasic.FileIO.TextFieldParser(CSVFile)
        TextFileReader.TextFieldType = FileIO.FieldType.Delimited
        TextFileReader.SetDelimiters(";")
        Dim TextFileTable As DataTable = Nothing
        Dim Column As DataColumn
        Dim Row As DataRow
        Dim UpperBound As Int32
        Dim ColumnCount As Int32
        Dim CurrentRow As String()

        While Not TextFileReader.EndOfData
            Try
                CurrentRow = TextFileReader.ReadFields()
                If Not CurrentRow Is Nothing Then
                    ''# Check if DataTable has been created
                    If TextFileTable Is Nothing Then
                        TextFileTable = New DataTable("TextFileTable")
                        ''# Get number of columns
                        UpperBound = CurrentRow.GetUpperBound(0)
                        ''# Create new DataTable
                        For ColumnCount = 0 To UpperBound
                            If ColumnCount = 3 Then
                                Column = New DataColumn()
                                Column.DataType = System.Type.GetType("System.Byte[]")

                                Column.ColumnName = "Column" & ColumnCount
                                Column.Caption = "Column" & ColumnCount
                                Column.ReadOnly = True
                                Column.Unique = False
                                TextFileTable.Columns.Add(Column)
                            Else
                                Column = New DataColumn()
                                Column.DataType = System.Type.GetType("System.String")
                                Column.ColumnName = "Column" & ColumnCount
                                Column.Caption = "Column" & ColumnCount
                                Column.ReadOnly = True
                                Column.Unique = False
                                TextFileTable.Columns.Add(Column)
                            End If

                        Next
                    End If
                    Row = TextFileTable.NewRow
                    For ColumnCount = 0 To UpperBound
                        If ColumnCount = 3 Then
                            If CurrentRow(ColumnCount).ToString <> Nothing Then
                                Debug.WriteLine("Img Path: [" & CurrentRow(ColumnCount).ToString & "]")
                                Dim img = Image.FromFile(CurrentRow(ColumnCount).ToString)
                                Dim ms = New MemoryStream()
                                img.Save(ms, System.Drawing.Imaging.ImageFormat.Png)
                                Row("Column" & ColumnCount) = ms.ToArray
                            End If
                            Debug.WriteLine("Img Null")
                        Else
                            Row("Column" & ColumnCount) = CurrentRow(ColumnCount).ToString
                        End If
                    Next
                    TextFileTable.Rows.Add(Row)
                End If
            Catch ex As  _
            Microsoft.VisualBasic.FileIO.MalformedLineException
                MsgBox("Line " & ex.Message & _
                "is not valid and will be skipped.")
            End Try
        End While
        TextFileTable.Columns(0).ColumnName = "Input Code"
        TextFileTable.Columns(1).ColumnName = "Rig Control"
        TextFileTable.Columns(2).ColumnName = "Final Controller Functions"
        TextFileTable.Columns(3).ColumnName = "Image"
        TextFileTable.Columns(4).ColumnName = "Final Game Function"
        TextFileTable.Columns(5).ColumnName = "Default Controller"
        TextFileTable.Columns(6).ColumnName = "Default Game Functions"
        TextFileTable.Columns(7).ColumnName = "Type"

        TextFileReader.Dispose()
        DataGridView1.DataSource = TextFileTable
    End Sub

根据来自定界文本文件的数据 table 在 datagridview 中显示图像

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