VB里如何让一个文本文件的内容在TEXTBOX控件里显示

LZ要的是拖放并打开吧~试试这个吧~
text1的OLEDropMode要设为1~

Private Sub Text1_OLEDragDrop(Data As DataObject, Effect As Long, Button As Integer, Shift As Integer, X As Single, Y As Single)

Dim FF As Integer

FF = FreeFile

Dim a As String
Dim b As String

Me.Caption = Data.Files.Item(1)

Open Data.Files.Item(1) For Input As #FF

Do Until EOF(FF)

Line Input #FF, b

a = a & b & vbNewLine

Loop

Text1.Text = a

Close

End Sub

如果要显示的内容太多，可以将文本框的multiline属性设置为true,再将文本框的scrollbars属性设定为2。
Private Sub Command1_Click()
Dim str As String
Open "d:\ABC.txt" For Input As #1
Do While Not EOF(1)
Line Input #1, str
Text1.Text = Text1.Text & str & vbCrLf
Loop
Close 1
End Sub

用下的代码就可以实现
Dim InputData As String, txt As String
Open "完整文件名" For Input As #1
Do While Not EOF(1)
Line Input #1, InputData
txt = txt & vbCrLf & InputData
Loop
Close
Text1.Text = txt