callermembername | 易学教程

WPF Notify PropertyChanged for a Get Property

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问题 I have the INotifyPropertyChanged implemented using CallerMemberName public event PropertyChangedEventHandler PropertyChanged; protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null) { if (PropertyChanged != null) { PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); } } So this could be called in the setter of any property as - OnPropertyChanged() which would notify property changed event whenever it is being set. This is not the case for a

CallerMemberName in .NET 4.0 not working

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问题 I am trying to use CallerMemberName attribute in .NET 4.0 via BCL portability pack. It is always returning an empty string instead of the member name. What am I doing wrong? public partial class Form1 : Form { public Form1() { InitializeComponent(); MessageBox.Show(new class2().CallMe); } } public class class2 { public string CallMe { get { return HelpMe(); } } private string HelpMe([CallerMemberName] string param = "") { return param; } } 回答1: Targeting 4.0 works just fine if you add:

CallerMemberName in .NET 4.0 not working

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My property does not update using [CallerMemberName]

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问题 Admittedly I am new to wpf. But i have spent some time Googling about it all and I am stumped. in essence i want to update my TextBlock in my UI using Binding whenever my Model values change. So this is my Model: using System.ComponentModel; using System.Runtime.CompilerServices; namespace WpfApplication1 { public class MyModel : INotifyPropertyChanged { protected void OnPropertyChanged([CallerMemberName] string propertyName = null) { this.PropertyChanged?.Invoke(this, new

How to use params keyword along with caller Information in C#?

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问题 I am trying to combine the C# 5.0 Caller Information along with the C# params keyword. The intention is to create a wrapper for a logging framework, and we want the logger to format the text like String.Format. In previous versions, the method looked like this: void Log( string message, params object[] messageArgs = null); And we call it like this: log.Log("{0}: I canna do it cap'n, the engines can't handle warp {1}!", "Scotty", warpFactor); Now, we want to capture caller information and log

Mixing optional parameters and params when can't simply overload

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问题 Similar to this question, I want to mix optional parameters with the params keyword, which of course creates ambiguity. Unfortunately, the answer of creating overloads does not work, as I want to take advantage of caller info attributes, like this: public void Info(string message, [CallerMemberName] string memberName = "", [CallerLineNumber] int lineNumber = 0, params object[] args) { _log.Info(BuildMessage(message, memberName, lineNumber), args); } Creating an overload without the optional

How to use params keyword along with caller Information in C#?

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I am trying to combine the C# 5.0 Caller Information along with the C# params keyword. The intention is to create a wrapper for a logging framework, and we want the logger to format the text like String.Format. In previous versions, the method looked like this: void Log( string message, params object[] messageArgs = null); And we call it like this: log.Log("{0}: I canna do it cap'n, the engines can't handle warp {1}!", "Scotty", warpFactor); Now, we want to capture caller information and log that as well. So the signature becomes: void Log( string message, params object[] messageArgs,

Mixing optional parameters and params when can't simply overload

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Similar to this question , I want to mix optional parameters with the params keyword, which of course creates ambiguity. Unfortunately, the answer of creating overloads does not work, as I want to take advantage of caller info attributes, like this: public void Info(string message, [CallerMemberName] string memberName = "", [CallerLineNumber] int lineNumber = 0, params object[] args) { _log.Info(BuildMessage(message, memberName, lineNumber), args); } Creating an overload without the optional parameters would change the call-site, preventing these particular parameters from working properly. I

CallerMemberName in .NET 4.0 not working

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I am trying to use CallerMemberName attribute in .NET 4.0 via BCL portability pack. It is always returning an empty string instead of the member name. What am I doing wrong? public partial class Form1 : Form { public Form1() { InitializeComponent(); MessageBox.Show(new class2().CallMe); } } public class class2 { public string CallMe { get { return HelpMe(); } } private string HelpMe([CallerMemberName] string param = "") { return param; } } Targeting 4.0 works just fine if you add: namespace System.Runtime.CompilerServices { sealed class CallerMemberNameAttribute : Attribute { } } Pradeep I

Is [CallerMemberName] slow compared to alternatives when implementing INotifyPropertyChanged?

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问题 There are good articles that suggest different ways for implementing INotifyPropertyChanged. Consider the following basic implementation: class BasicClass : INotifyPropertyChanged { public event PropertyChangedEventHandler PropertyChanged; private void FirePropertyChanged(string propertyName) { var handler = PropertyChanged; if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName)); } private int sampleIntField; public int SampleIntProperty { get { return sampleIntField;