---
source_files:
  - Common/DTS.Common/obj/x86/Debug/GeneratedInternalTypeHelper.g.cs
  - Common/DTS.Common/obj/x86/Debug/GeneratedInternalTypeHelper.g.i.cs
generated_at: "2026-04-16T02:56:51.283838+00:00"
model: "Qwen/Qwen3-Coder-Next-FP8"
schema_version: 1
sha256: "708a410ec1ac79c2"
---

# Debug

## Documentation: `GeneratedInternalTypeHelper`

### 1. Purpose  
This module provides a WPF-specific runtime helper class used internally during XAML parsing and object initialization. It extends `System.Windows.Markup.InternalTypeHelper` to customize how objects are instantiated, property values are read/written, and event handlers are attached—primarily to support WPF’s XAML infrastructure (e.g., for `x:Class`, `x:Name`, or event wiring in compiled XAML). It is **not intended for direct use** by application code and is auto-generated by the `PresentationBuildTasks` MSBuild task during the build process.

### 2. Public Interface  
The class is `sealed` and inherits from `InternalTypeHelper`. All members are `protected override` methods—**not public API**—but are included here for completeness.

- **`protected override object CreateInstance(Type type, CultureInfo culture)`**  
  Instantiates the given `type` using reflection, allowing both public and non-public constructors (via `BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.CreateInstance`). Returns the new instance.

- **`protected override object GetPropertyValue(PropertyInfo propertyInfo, object target, CultureInfo culture)`**  
  Reads the value of `propertyInfo` on `target` using default binding flags (`BindingFlags.Default`). Returns the property value.

- **`protected override void SetPropertyValue(PropertyInfo propertyInfo, object target, object value, CultureInfo culture)`**  
  Writes `value` to `propertyInfo` on `target` using default binding flags.

- **`protected override Delegate CreateDelegate(Type delegateType, object target, string handler)`**  
  Dynamically creates a delegate of `delegateType` bound to the instance method named `handler` on `target`. Uses reflection to invoke the *non-public* instance method `_CreateDelegate` on `target.GetType()`.  
  ⚠️ **Note**: This relies on an internal implementation detail (`_CreateDelegate`) of the target object’s type.

- **`protected override void AddEventHandler(EventInfo eventInfo, object target, Delegate handler)`**  
  Attaches `handler` to the event represented by `eventInfo` on `target` using `EventInfo.AddEventHandler`.

### 3. Invariants  
- The class is `sealed` and inherits from `System.Windows.Markup.InternalTypeHelper`, meaning it is tightly coupled to WPF’s XAML infrastructure.
- All methods use reflection with explicit `BindingFlags`; no method relies on dynamic invocation beyond what is visible in the source.
- The `CreateDelegate` method assumes the `target` object’s type exposes a non-public instance method named `_CreateDelegate` accepting `(Type, string)`—this is an internal contract with WPF’s runtime, not a documented public API.
- The class is marked with `[EditorBrowsable(EditorBrowsableState.Never)]`, indicating it should never appear in IntelliSense or designer tooling.

### 4. Dependencies  
- **Depends on**:  
  - `System.Windows.Markup.InternalTypeHelper` (base class)  
  - `System.Activator`, `System.Reflection` (for reflection-based object creation/property/event handling)  
  - `System.Globalization.CultureInfo` (for culture-sensitive operations)  
  - `PresentationBuildTasks` (the MSBuild task that generates this file)  
- **Used by**:  
  - WPF’s XAML compiler/runtime (e.g., `BamlReader`, `XamlWriter`, or generated BAML code) during deserialization or event wiring.  
  - Likely referenced indirectly via `x:Class` or `x:Name` in XAML files compiled into the same assembly.  
  - *Not* referenced directly by application code.

### 5. Gotchas  
- **Auto-generated file**: This file is regenerated on every build; manual edits will be lost.  
- **Non-public contract**: The `_CreateDelegate` reflection call in `CreateDelegate` is fragile—it depends on an undocumented, internal method of the target type. If the target type changes or does not implement `_CreateDelegate`, this will throw a `MissingMethodException` at runtime.  
- **No public surface area**: This class is strictly internal infrastructure. Developers should never instantiate or extend it.  
- **Culture handling**: All methods accept a `CultureInfo` parameter but pass it directly to reflection APIs—behavior may vary across cultures (e.g., case sensitivity in property/event names is not affected, but custom type converters might be).  
- **No error handling visible**: The source shows no explicit exception handling; failures (e.g., missing methods, inaccessible properties) will propagate as reflection exceptions.  
- **None identified from source alone** for typical usage patterns—only the above technical caveats are evident.