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68 lines
1.5 KiB
68 lines
1.5 KiB
4 years ago
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#if NET20 || NET30 || NET35 || NET40 || !NET_4_6
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using System.Threading;
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namespace System
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{
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// This class is new in .NET 4.5
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public class Progress<T> : IProgress<T>
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{
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private readonly Action<T> _post;
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public Progress()
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{
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var context = SynchronizationContext.Current;
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if (context == null)
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{
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_post = value =>
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{
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ThreadPool.QueueUserWorkItem(Callback, value);
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};
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}
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else
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{
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_post = value =>
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{
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context.Post(Callback, value);
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};
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}
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}
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public Progress(Action<T> handler)
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: this()
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{
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if (handler == null)
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{
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throw new ArgumentNullException("handler");
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}
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ProgressChanged += (sender, args) => handler(args);
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}
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internal event LinqInternal.Core.NewEventHandler<T> ProgressChanged;
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public void Report(T value)
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{
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OnReport(value);
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}
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protected virtual void OnReport(T value)
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{
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if (ProgressChanged != null)
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{
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_post(value);
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}
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}
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private void Callback(object value)
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{
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var valueT = (T)value;
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var progressChanged = ProgressChanged;
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if (progressChanged != null)
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{
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progressChanged.Invoke(this, valueT);
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}
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}
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}
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}
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#endif
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