TypeAccessException Class
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TypeAccessException Class


The exception that is thrown when a method attempts to use a type that it does not have access to.

Namespace:   System
Assembly:  mscorlib (in mscorlib.dll)


public class TypeAccessException : TypeLoadException


Initializes a new instance of the TypeAccessException class with a system-supplied message that describes the error.

System_CAPS_protmethodTypeAccessException(SerializationInfo, StreamingContext)

Initializes a new instance of the TypeAccessException class with serialized data.


Initializes a new instance of the TypeAccessException class with a specified message that describes the error.

System_CAPS_pubmethodTypeAccessException(String, Exception)

Initializes a new instance of the TypeAccessException class with a specified error message and a reference to the inner exception that is the cause of this exception.


Gets a collection of key/value pairs that provide additional user-defined information about the exception.(Inherited from Exception.)


Gets or sets a link to the help file associated with this exception.(Inherited from Exception.)


Gets or sets HRESULT, a coded numerical value that is assigned to a specific exception.(Inherited from Exception.)


Gets the Exception instance that caused the current exception.(Inherited from Exception.)


Gets the error message for this exception.(Inherited from TypeLoadException.)


Gets or sets the name of the application or the object that causes the error.(Inherited from Exception.)


Gets a string representation of the immediate frames on the call stack.(Inherited from Exception.)


Gets the method that throws the current exception.(Inherited from Exception.)


Gets the fully qualified name of the type that causes the exception.(Inherited from TypeLoadException.)


Determines whether the specified object is equal to the current object.(Inherited from Object.)


Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)


When overridden in a derived class, returns the Exception that is the root cause of one or more subsequent exceptions.(Inherited from Exception.)


Serves as the default hash function. (Inherited from Object.)

System_CAPS_pubmethodGetObjectData(SerializationInfo, StreamingContext)

Sets the SerializationInfo object with the class name, method name, resource ID, and additional exception information.(Inherited from TypeLoadException.)


Gets the runtime type of the current instance.(Inherited from Exception.)


Creates a shallow copy of the current Object.(Inherited from Object.)


Creates and returns a string representation of the current exception.(Inherited from Exception.)


Occurs when an exception is serialized to create an exception state object that contains serialized data about the exception.(Inherited from Exception.)

TypeAccessException is thrown when a method attempts to cast an object to a type that is not accessible from the method. For example, an anonymously hosted dynamic method cannot access a security-critical type because the method is . If the method contains a OpCodes.Castclass instruction that casts an object to a security-critical type, or to a generic type that has a security-critical type as one of its type parameters, TypeAccessException is thrown by the JIT compiler.

Similarly, TypeAccessException is thrown for a dynamic method that uses an internal type from another assembly. A method might not have access to its containing type, its return type, or one of its parameter types.

Apps compiled by using the .NET Native tool chain may throw a exception at runtime. is an internal-only exception type derived from TypeAccessException. The exception indicates that metadata needed for the successful execution of an app is not present at runtime. You should not use a try/catch block to handle the exception. Instead, you should determine what metadata is missing and modify your app's to ensure that it is present at runtime.

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Available since 4.0
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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