C# 将UserControl强制转换为特定类型的用户控件
有没有办法将用户控件强制转换为特定的用户控件,以便我可以访问它的公共属性?基本上,我正在浏览占位符的控件集合,并尝试访问用户控件的公共属性C# 将UserControl强制转换为特定类型的用户控件,c#,asp.net,user-controls,C#,Asp.net,User Controls,有没有办法将用户控件强制转换为特定的用户控件,以便我可以访问它的公共属性?基本上,我正在浏览占位符的控件集合,并尝试访问用户控件的公共属性 foreach(UserControl uc in plhMediaBuys.Controls) { uc.PulblicPropertyIWantAccessTo; } 铸造 我更喜欢使用: foreach(UserControl uc in plhMediaBuys.Controls) { ParticularUCType myCont
foreach(UserControl uc in plhMediaBuys.Controls)
{
uc.PulblicPropertyIWantAccessTo;
}
铸造
我更喜欢使用:
foreach(UserControl uc in plhMediaBuys.Controls)
{
ParticularUCType myControl = uc as ParticularUCType;
if (myControl != null)
{
// do stuff with myControl.PulblicPropertyIWantAccessTo;
}
}
主要是因为使用is关键字会导致两次(准昂贵)强制转换:
工具书类
foreach(UserControl uc in plhMediaBuys.Controls) {
MyControl c = uc as MyControl;
if (c != null) {
c.PublicPropertyIWantAccessTo;
}
}
foreach(UserControl uc in plhMediaBuys.Controls)
{
ParticularUCType myControl = uc as ParticularUCType;
if (myControl != null)
{
// do stuff with myControl.PulblicPropertyIWantAccessTo;
}
}
if( uc is ParticularUCType ) // one cast to test if it is the type
{
ParticularUCType myControl = (ParticularUCType)uc; // second cast
ParticularUCType myControl = uc as ParticularUCType; // same deal this way
// do stuff with myControl.PulblicPropertyIWantAccessTo;
}