DllNotFoundException Class


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The exception that is thrown when a DLL specified in a DLL import cannot be found.

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


public class DllNotFoundException : TypeLoadException


Initializes a new instance of the DllNotFoundException class with default properties.

System_CAPS_protmethodDllNotFoundException(SerializationInfo, StreamingContext)

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


Initializes a new instance of the DllNotFoundException class with a specified error message.

System_CAPS_pubmethodDllNotFoundException(String, Exception)

Initializes a new instance of the DllNotFoundException 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.)

DllNotFoundException uses the HRESULT COR_E_DLLNOTFOUND, which has the value 0x80131524.

For a list of initial property values for an instance of DllNotFoundException, see the DllNotFoundException constructors.

The DllNotFoundException is thrown when a dynamic link library defined by the System.Runtime.InteropServices.DllImportAttribute attribute or a comparable language construct, such as the Visual Basic Declare statement, cannot be found. It is not thrown when the common language runtime is unable to load a .NET Framework assembly.

Note that the DllImportAttribute can specify the path to the directory in which the DLL resides. If a path is not specified, Windows uses the search order described in Dynamic-Link Library Search Order.

Universal Windows Platform
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
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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