processing-parallel-taskslisted
Install: claude install-skill christian289/dotnet-with-claudecode
# .NET Parallel Processing
A guide for APIs and patterns for parallel processing of CPU-bound tasks.
**Quick Reference:** See [QUICKREF.md](QUICKREF.md) for essential patterns at a glance.
## 1. Core APIs
| API | Purpose |
|-----|---------|
| `Parallel.For`, `Parallel.ForEach` | CPU-bound parallel processing |
| `PLINQ (.AsParallel())` | LINQ query parallelization |
| `Partitioner<T>` | Large data partitioning |
| `ConcurrentDictionary<K,V>` | Thread-safe dictionary |
---
## 2. Parallel Class
### 2.1 Parallel.ForEach
```csharp
public sealed class ImageProcessor
{
public void ProcessImages(IEnumerable<string> imagePaths)
{
var options = new ParallelOptions
{
MaxDegreeOfParallelism = Environment.ProcessorCount
};
Parallel.ForEach(imagePaths, options, path =>
{
ProcessImage(path);
});
}
}
```
### 2.2 Early Termination
```csharp
Parallel.For(0, data.Length, (i, state) =>
{
if (data[i] == target)
{
state.Break();
}
});
```
---
## 3. PLINQ
```csharp
var results = data
.AsParallel()
.WithDegreeOfParallelism(Environment.ProcessorCount)
.Where(d => d.IsValid)
.Select(d => Transform(d))
.ToList();
// When order preservation is needed
var results = data
.AsParallel()
.AsOrdered()
.Select(d => Process(d))
.ToList();
```
---
## 4. Thread-Safe Collections
| Collection | Purpose |
|------------|---------|
| `ConcurrentDictionary<K,V>`