微软.net精简框架常见问题及回答(中文版)(26)
// Get/Set the uint
public uint uiDummy
{
get {return BitConverter.ToUInt32(m_data, 0);}
set
{
Buffer.BlockCopy(BitConverter.GetBytes(value),0,m_data,0,BitConverter.GetBytes(value).Length);
}
}
// Get/Set the short
public short sDummy
{
get {return BitConverter.ToInt16(m_data, 4);}
set
{
Buffer.BlockCopy(BitConverter.GetBytes(value),0,m_data,4,BitConverter.GetBytes(value).Length);
}
}
}
byte[] fromFile = {1,1,1,1,2,2};
MyClass myClass = new MyClass(fromFile);
uint test1 = myClass.uiDummy; // 0x1010101
short test2 = myClass.sDummy; // 0x202
myClass.sDummy = 0x0505; // Test setting the short
uint test4 = myClass.uiDummy; // 0x1010101
short test5 = myClass.sDummy; // 0x505
'VB
Public Class ByteClass
Protected m_data As Byte() = Nothing
' uint uiDummy
' short sDummy
' This is a bit unsafe so you should throw an exception
' or assert if the byte array length is not 6. A safer
' but less memory efficient approach would be to set
' m_data = new byte[6] and then copy bytes to m_data.
Public Sub New(ByVal bytes() As Byte)
m_data = bytes
End Sub 'New
' Get/Set the uint
Public Property uiDummy() As UInt32
Get
Return BitConverter.ToUInt32(m_data, 0)
End Get
Set(ByVal Value As System.UInt32)
Buffer.BlockCopy(BitConverter.GetBytes(Value),0,m_data,0,BitConverter.GetBytes(Value).Length)
End Set
End Property
' Get/Set the short
Public Property sDummy() As Short
Get
Return BitConverter.ToInt16(m_data, 4)
End Get
Set(ByVal Value As Short)
Buffer.BlockCopy(BitConverter.GetBytes(Value),0,m_data,4,BitConverter.GetBytes(Value).Length)
End Set
End Property
End Class 'ByteClass
Dim fromFile As Byte() = {1, 1, 1, 1, 2, 2}
Dim testClass As New ByteClass(fromFile)
Dim test1 As System.UInt32 = testClass.uiDummy ' 0x1010101
Dim test2 As Short = testClass.sDummy ' 0x202
testClass.sDummy = &H505 ' Test short
Dim test4 As System.UInt32 = testClass.uiDummy ' 0x1010101
Dim test5 As Short = testClass.sDummy ' 0x505
7.10. 我可以建立一个委托(delegate)交给Invoke吗？
不可以。在.net精简框架中，只有EventHandler方法可以被调用。以下代码说明啊如何正确使用此方法：
//C#
public void HandleMe(object o, EventArgs e) {...}
form.Invoke(new EventHandler(form.HandleMe));
'VB
Public Sub HandleMe(o As Object, e As EventArgs)
End Sub 'HandleMe
form.Invoke(New EventHandler(AddressOf form.HandleMe))
Although the following will compile, it will not work properly:
//C#
public delegate void MyHandler();
public void HandleMeBadly() {...}
form.Invoke(new MyHandler(form.HandleMeBadly));