[英]Can't Set variable value in Static Field
In this simple example Why StrA
in Sample()
function Can't set with "Hi World" string ? 在这个简单的示例中,为什么
Sample()
函数中的StrA
无法设置为“ Hi World”字符串?
string StrA { get; set; }
private void button1(object sender, EventArgs e)
{
StrA = "Hi World"; //=======> Get StrA value
}
public static string Sample()
{
MyClass MyClass1 = new MyClass();
string a = MyClass1.StrA; //==========> Can't Set StrA value with "Hi World" string ???
return (MessageBox.Show(a).ToString());
}
make StrA a static field, right now it's just a local property of the instance, so when you create a new instance with MyClass1 = new MyClass(); 将StrA设置为静态字段,现在它只是实例的本地属性,因此当您使用MyClass1 = new MyClass()创建新实例时;
the StrA property is empty (null) and even if you set it a value, after you create a new instance that new instance will have SrtA as empty... StrA属性为空(空),即使您将其设置为一个值,在创建新实例后,新实例也会将SrtA设置为空...
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