In Unity Ive got a object of a class with many fields. Some of them are marked with [CockpitControlled] attribute, which I defined as:
[AttributeUsage(AttributeTargets.Field)]
public class CockpitControlled : Attribute
{
}
In some other class I would to get a list of all those field as I would like to change them. Question is how?
By reflection, you get the fields of a type and check if the attribute is present.
Example:
[AttributeUsage(AttributeTargets.Field)]
public class CockpitControlled : Attribute
{
public int SomeValue { get; set; }
}
public class SomeData
{
private string _data1;
[CockpitControlled]
private string _data2;
private string _data3;
[CockpitControlled( SomeValue = 42)]
private string _data4;
}
static void Main(string[] args)
{
foreach(var field in typeof(SomeData).GetFields(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic))
{
var att = field.GetCustomAttributes(typeof(CockpitControlled), true).FirstOrDefault() as CockpitControlled;
if(att == null)
{
Console.WriteLine($"The field {field.Name} isn't CockpitControlled");
}
else
{
Console.WriteLine($"The field {field.Name} is CockpitControlled with the value {att.SomeValue}");
}
}
}
Ouput:
The field _data1 isn't CockpitControlled
The field _data2 is CockpitControlled with the value 0
The field _data3 isn't CockpitControlled
The field _data4 is CockpitControlled with the value 42
Edit:
This example set "bbb" in instance's fields that are CockpitControlled with the value "aaa":
[AttributeUsage(AttributeTargets.Field)]
public class CockpitControlled : Attribute
{ }
public class SomeData
{
public string _data1;
[CockpitControlled]
public string _data2;
[CockpitControlled]
public string _data3;
}
static void Main()
{
// Create a instance
var datas = new SomeData { _data1 = "aaa", _data2 = "aaa", _data3 = "zzz", };
// For each field of the instance
foreach (var field in datas.GetType().GetFields(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic))
{
// Check if the field is CockpitControlled
var att = field.GetCustomAttributes(typeof(CockpitControlled), true).FirstOrDefault() as CockpitControlled;
if (att != null)
{
// Get the value of the field
var curentValue = (string)field.GetValue(datas);
// If the value of the field equal "aaa"
if (curentValue == "aaa")
// Set "bbb"
field.SetValue(datas, "bbb");
}
}
Console.WriteLine(datas._data1);
Console.WriteLine(datas._data2);
Console.WriteLine(datas._data3);
}
Result:
aaa
bbb
zzz
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.