我正在创建一个用户控件并向其添加一个文本大小属性。在将文本绘制到控件上之前，我需要知道文本大小有多大，以便我可以将其相对于控件的高度和宽度居中。
我假设这是一个 Windows API 命令。但是，我无法找到有关它的任何信息。
Public Sub DrawImage(ByVal gr As Graphics)
If Me.Image Is Nothing Then Return
Dim r As Rectangle = New Rectangle(8, 8, Me.ImageSize.Width, Me.ImageSize.Height)
Select Case Me.ImageAlign
Case ContentAlignment.TopLeft
r = New Rectangle(4, 4, Me.ImageSize.Width, Me.ImageSize.Height)
Case ContentAlignment.TopCenter
r = New Rectangle((Me.Width / 2 - Me.ImageSize.Width / 2) / 2, 4, Me.ImageSize.Width, Me.ImageSize.Height)
Case ContentAlignment.TopRight
r = New Rectangle(Me.Width - 4 - Me.ImageSize.Width, 4, Me.ImageSize.Width, Me.ImageSize.Height)
Case ContentAlignment.MiddleLeft
r = New Rectangle(8, Me.Height / 2 - Me.ImageSize.Height / 2, Me.ImageSize.Width, Me.ImageSize.Height)
Case ContentAlignment.MiddleCenter
r = New Rectangle(Me.Width / 2 - Me.ImageSize.Width / 2, Me.Height / 2 - Me.ImageSize.Height / 2, Me.ImageSize.Width, Me.ImageSize.Height)
Case ContentAlignment.MiddleRight
r = New Rectangle(Me.Width - 8 - Me.ImageSize.Width, Me.Height / 2 - Me.ImageSize.Height / 2, Me.ImageSize.Width, Me.ImageSize.Height)
Case ContentAlignment.BottomLeft
r = New Rectangle(8, Me.Height - 8 - Me.ImageSize.Height, Me.ImageSize.Width, Me.ImageSize.Height)
Case ContentAlignment.BottomCenter
r = New Rectangle(Me.Width / 2 - Me.ImageSize.Width / 2, Me.Height - 8 - Me.ImageSize.Height, Me.ImageSize.Width, Me.ImageSize.Height)
Case ContentAlignment.BottomRight
r = New Rectangle(Me.Width - 8 - Me.ImageSize.Width, Me.Height - 8 - Me.ImageSize.Height, Me.ImageSize.Width, Me.ImageSize.Height)
End Select
gr.DrawString("Header", New Font("MS SANS SERIF", 8.25, FontStyle.Regular, GraphicsUnit.Point, 1, True), Brushes.Black, 0, 0)
'gr.DrawImage(Me.Image, r)
End Sub
正如您所看到的@ gr.DrawString，我需要知道预测的文本有多大，以便我可以调整控件的大小并在控件中居中放置文本。