此代码vb.net的等效点网2.0 [英] Dot net 2.0 equivalent for this code vb.net

问题描述

似乎此代码需要.NET Framework 3.5，我需要在.net 2.0框架中使用相同的代码，代码如下.

It seems this code required .Net framework 3.5, i need same equivalent in .net 2.0 framework,code is below.

Dim rtb As RichTextBox = Me.Controls.OfType(Of RichTextBox)()

推荐答案

OfType不会产生单个元素，而是它们的集合(IEnumerable). 参见此处 [

OfType does not produce a single element but rather a collection (IEnumerable) of them. See here[^].
You can reproduce the OfType extension method in .NET 2.0 along these lines:

    List<RichTextBox> widgets = new List<RichTextBox>(); 
    foreach(Control control in this.Controls) 
    { 
        // If it is of type RichTextBox add it to the list 
        // In VB.NET the condition would be like: TypeOf control Is RichTextBox
        if(control is RichTextBox) 
            widgets.Add((RichTextBox)control); 
    } 
}

这个例子在C#中，但是我希望您能理解发生了什么.

问候，

曼弗雷德(Manfred)

This example is in C#, but I hope you can understand what is going on.

Regards,

Manfred

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