---
source_files:
  - DataPRO/DataPRO.Core/Settings/SettingsChangedEventArgs.cs
  - DataPRO/DataPRO.Core/Settings/SettingsCollection.cs
generated_at: "2026-04-17T15:42:20.133577+00:00"
model: "zai-org/GLM-5-FP8"
schema_version: 1
sha256: "19770357354d5bed"
---

# Documentation: DataPRO.Core.Settings

## 1. Purpose

This module provides an observable dictionary implementation for application settings management. The `SettingsCollection<TKey, TItem>` class wraps a standard `Dictionary<TKey, TItem>` and raises events when items are added, removed, modified, or when the collection is cleared. This enables consumers to react to configuration changes in real-time without polling. The module is designed to serve as the foundation for a settings system where UI components or services need to be notified when preferences change.

---

## 2. Public Interface

### `SettingsCollection<TKey, TItem>`

A generic dictionary implementation that implements `IDictionary<TKey, TItem>` with change notification.

#### Events

| Signature | Description |
|-----------|-------------|
| `event EventHandler<SettingsChangedEventArgs<TKey, TItem>> CollectionItemPropertyChanged` | Fired after any mutation operation (add, remove, modify, clear). Event args contain the change type and optionally the key/item involved. |

#### Constructors

The class provides only the default parameterless constructor (inherited from `Object`).

#### Methods

| Signature | Description |
|-----------|-------------|
| `void Add(TKey key, TItem value)` | Adds a key-value pair to the collection. Fires `CollectionItemPropertyChanged` with `ChangeSettingType.Add`. |
| `void Add(KeyValuePair<TKey, TItem> item)` | Adds a key-value pair via `KeyValuePair`. Fires `CollectionItemPropertyChanged` with `ChangeSettingType.Add`. |
| `bool Remove(TKey key)` | Removes the item with the specified key. Returns `true` if removed; fires event with `ChangeSettingType.Remove` only on success. |
| `bool Remove(KeyValuePair<TKey, TItem> item)` | Removes by `KeyValuePair.Key` (value is ignored). Fires event with `ChangeSettingType.Remove` only on success. |
| `void Clear()` | Removes all items. Fires `CollectionItemPropertyChanged` with `ChangeSettingType.ClearAll`. |
| `bool ContainsKey(TKey key)` | Returns `true` if the key exists. |
| `bool Contains(KeyValuePair<TKey, TItem> item)` | Returns `true` if both key and value match an entry in the collection. |
| `bool TryGetValue(TKey key, out TItem value)` | Attempts to retrieve the value for the given key. Returns `false` if key not found. |
| `IEnumerator<KeyValuePair<TKey, TItem>> GetEnumerator()` | Returns an enumerator over the collection. |
| `void CopyTo(KeyValuePair<TKey, TItem>[] array, int arrayIndex)` | **Throws `NotImplementedException`**. |

#### Properties

| Signature | Description |
|-----------|-------------|
| `TItem this[TKey key]` (getter) | Returns the value associated with the key. Throws `KeyNotFoundException` if key absent.