如何在 C# 中访问用户控件的属性
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How to access properties of a usercontrol in C#
提问by Pedro Luz
I've made a C# usercontrol with one textbox and one richtextbox.
我制作了一个带有一个文本框和一个富文本框的 C# 用户控件。
How can I access the properties of the richtextbox from outside the usercontrol.
如何从用户控件外部访问富文本框的属性。
For example.. if i put it in a form, how can i use the Text propertie of the richtextbox???
例如..如果我把它放在一个表单中，我如何使用richtextbox的Text属性？？？
thanks
谢谢
采纳答案by M4N
Cleanest way is to expose the desired properties as properties of your usercontrol, e.g:
最简洁的方法是将所需的属性公开为用户控件的属性，例如：
class MyUserControl
{
// expose the Text of the richtext control (read-only)
public string TextOfRichTextBox
{
get { return richTextBox.Text; }
}
// expose the Checked Property of a checkbox (read/write)
public bool CheckBoxProperty
{
get { return checkBox.Checked; }
set { checkBox.Checked = value; }
}
//...
}
In this way you can control which properties you want to expose and whether they should be read/write or read-only. (of course you should use better names for the properties, depending on their meaning).
通过这种方式，您可以控制要公开哪些属性以及它们应该是读/写还是只读。（当然，您应该为属性使用更好的名称，具体取决于它们的含义）。
Another advantage of this approach is that it hides the internal implementation of your user control. Should you ever want to exchange your richtext control with a different one, you won't break the callers/users of your control.
这种方法的另一个优点是它隐藏了用户控件的内部实现。如果您想将富文本控件与不同的控件交换，则不会破坏控件的调用者/用户。
回答by Robert Venables
Change the access modifier ("Modifiers") of the RichTextBox in the property grid to Public.
将属性网格中 RichTextBox 的访问修饰符（“Modifiers”）更改为 Public。
回答by Fabrizio C.
Add a property to the usercontrol like this
像这样向用户控件添加一个属性
public string TextBoxText
{
get
{
return textBox1.Text;
}
set
{
textBox1.Text = value;
}
}
回答by Timothy Carter
You need to make a public property for the richtextbox, or expose some other property that does the job of setting the richtextbox text like:
您需要为富文本框创建一个公共属性，或者公开一些其他属性来设置富文本框文本，例如：
private RichTextBox rtb;
public string RichTextBoxText
{
get
{
return rtb.Text;
}
set
{
rtb.Text = value;
}
}
回答by JYelton
I recently had some issues doing this with a custom class:
我最近在使用自定义类时遇到了一些问题：
A user control had a public property which was of a custom class type. The designer by default tries to assign some value to it, so in the designer code, the line userControlThing.CustomClassProperty = nullwas being automatically added.
用户控件具有自定义类类型的公共属性。默认情况下，设计器会尝试为其分配一些值，因此在设计器代码中，userControlThing.CustomClassProperty = null会自动添加该行。
The intent was to be able to provide the user control with a custom class at any point while running the program (to change values visible to the user). Because the set {}portion did not check for null values, various errors were cropping up.
目的是能够在运行程序的任何时候为用户控件提供自定义类（以更改用户可见的值）。由于该set {}部分没有检查空值，因此会出现各种错误。
The solution was to change the property to a private one, and use two public methods to set and get the value. The designer will try to auto-assign properties, but leaves methods alone.
解决方案是将属性更改为私有属性，并使用两个公共方法来设置和获取值。设计器将尝试自动分配属性，但不理会方法。
