[英]How to get the name of a parameter passed to a method?
I currently have a validation class with a method which validates that a string is not null (and logs the info, but that's not the concern here)我目前有一个验证类,其中包含一个验证字符串不为空的方法(并记录信息,但这不是这里的问题)
protected void ValidateStringNotEmpty(string propertyName, string value)
{
if (string.IsNullOrWhiteSpace(value))
{
ValidationErrors.Add($"Property [{propertyName}] must be filled");
}
}
which is called using这被称为使用
ValidateStringNotEmpty(nameof(Name), Name);
Is there an easy (and optimized) way to prevent the need to pass the first argument nameof(property)
?是否有一种简单(和优化)的方法来防止需要传递第一个参数
nameof(property)
?
I saw solutions using the stacktrace to trace the call back, but it does not seem to be a great solution...我看到了使用 stacktrace 来跟踪回调的解决方案,但这似乎不是一个很好的解决方案......
EDIT: What I'm really trying to do is see if something exists to do this (removing the need to pass the name of the argument).编辑:我真正想做的是看看是否存在可以执行此操作的内容(无需传递参数名称)。 I know the pragmatic solution is the one I already use, and this is not a problem.
我知道务实的解决方案是我已经使用的解决方案,这不是问题。
现在有“CallerArgumentExpression”,它随 dotnet 6 / C# 10 一起提供,并且完全符合您的要求
protected void ValidateStringNotEmpty(string value, [CallerArgumentExpression("value")] string propertyName = "")
What about validating directly inside the property and leveraging [CallerMemberName]
?直接在属性内部验证并利用
[CallerMemberName]
怎么样?
private string _text;
public string Text
{
get => _text;
set
{
if (IsValid(value))
{
_text = value;
}
else
{
ValidationErrors.Add("'abcd' was expected.");
}
}
}
private bool IsValid<T>(T value, [CallerMemberName] string propertyName = null)
{
switch (propertyName)
{
case nameof(Text):
return value as string == "abcd";
default:
throw new ArgumentOutOfRangeException(nameof(propertyName), propertyName, null);
}
}
public static class ValidationErrors
{
public static void Add(string message, [CallerMemberName] string propertyName = null)
{
throw new NotImplementedException();
}
}
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