37 lines
1.7 KiB
Markdown
37 lines
1.7 KiB
Markdown
---
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source_files:
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- Common/DTS.Common/Classes/DTS.Viewer/Commands/RelayCommand.cs
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generated_at: "2026-04-17T16:40:01.838480+00:00"
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model: "zai-org/GLM-5-FP8"
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schema_version: 1
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sha256: "24962272b11a45e1"
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---
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# Commands
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## Documentation: `DTS.Common.Classes.Viewer.Commands.RelayCommand`
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### 1. Purpose
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This module provides an implementation of the `System.Windows.Input.ICommand` interface designed to delegate logic to methods passed as parameters. It exists to support the MVVM (Model-View-ViewModel) pattern within the DTS Viewer application, allowing UI controls (like buttons) to bind to actions defined in ViewModels without requiring the creation of separate concrete command classes for every action.
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### 2. Public Interface
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**Constructors**
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* `public RelayCommand(Action<object> execute)`
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* Initializes a new instance of the `RelayCommand` class that can always execute.
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* **Parameter:** `execute` — The execution logic delegate.
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* **Behavior:** Calls the overloaded constructor with `null` for the `canExecute` predicate.
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* `public RelayCommand(Action<object> execute, Predicate<object> canExecute)`
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* Initializes a new instance of the `RelayCommand` class.
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* **Parameters:**
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* `execute` — The execution logic delegate.
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* `canExecute` — The execution status logic delegate (optional).
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* **Behavior:** Throws an `ArgumentNullException` named "execute" if the `execute` delegate is null. Assigns delegates to internal readonly fields.
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**Methods**
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* `public bool CanExecute(object parameter)`
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* Determines if the command can execute in its current state.
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* **Behavior:** Returns `true` if `_canExecute` is `null`. Otherwise, returns the result of invoking `_canExecute(parameter)` |