MissingManifestResourceException Class


The exception that is thrown if the main assembly does not contain the resources for the neutral culture, and an appropriate satellite assembly is missing.

public ref class MissingManifestResourceException : SystemException
public class MissingManifestResourceException : SystemException
type MissingManifestResourceException = class
    inherit SystemException
Public Class MissingManifestResourceException
Inherits SystemException


.NET apps

In .NET Framework and .NET Core apps, MissingManifestResourceException is thrown when the attempt to retrieve a resource fails because the resource set for the neutral culture could not be loaded from a particular assembly. Although the exception is thrown when you try to retrieve a particular resource, it is caused by the failure to load the resource set rather than the failure to find the resource.


For additional information, see the "Handling a MissingManifestResourceException Exception" section in the ResourceManager class topic.

The main causes of the exception include the following:

  • The resource set is not identified by its fully qualified name. For example, if the baseName parameter in the call to the ResourceManager.ResourceManager(String, Assembly) method specifies the root name of the resource set without a namespace, but the resource set is assigned a namespace when it is stored in its assembly, the call to the ResourceManager.GetString method throws this exception.

    If you have embedded the .resources file that contains the default culture's resources in your executable and your app is throwing a MissingManifestResourceException, you can use a reflection tool such as the IL Disassembler (Ildasm.exe) to determine the fully qualified name of the resource. In ILDasm, double click the executable's MANIFEST label to open the MANIFEST window. Resources appear as .mresource items and are listed after external assembly references and custom assembly-level attributes. You can also compile the following simple utility, which lists the fully qualified names of embedded resources in the assembly whose name is passed to it as a command-line parameter.

    using System;
    using System.IO;
    using System.Reflection;
    using System.Resources;
    public class Example
       public static void Main()
          if (Environment.GetCommandLineArgs().Length == 1) { 
             Console.WriteLine("No filename.");
          string filename = Environment.GetCommandLineArgs()[1].Trim();
          // Check whether the file exists.
          if (! File.Exists(filename)) {
             Console.WriteLine("{0} does not exist.", filename);
          // Try to load the assembly.
          Assembly assem = Assembly.LoadFrom(filename);
          Console.WriteLine("File: {0}", filename);
          // Enumerate the resource files.
          string[] resNames = assem.GetManifestResourceNames();
          if (resNames.Length == 0)
             Console.WriteLine("   No resources found.");
          foreach (var resName in resNames)
             Console.WriteLine("   Resource: {0}", resName.Replace(".resources", ""));
    Imports System.IO
    Imports System.Reflection
    Imports System.Resources
    Module Example
       Public Sub Main()
          If Environment.GetCommandLineArgs.Length = 1 Then 
             Console.WriteLine("No filename.")
             Exit Sub
          End If
          Dim filename As String = Environment.GetCommandLineArgs(1).Trim()
          ' Check whether the file exists.
          If Not File.Exists(filename) Then
             Console.WriteLine("{0} does not exist.", filename)
             Exit Sub
          End If   
          ' Try to load the assembly.
          Dim assem As Assembly = Assembly.LoadFrom(filename)
          Console.WriteLine("File: {0}", filename)
          ' Enumerate the resource files.
          Dim resNames() As String = assem.GetManifestResourceNames()
          If resNames.Length = 0 Then
             Console.WriteLine("   No resources found.")
          End If
          For Each resName In resNames
             Console.WriteLine("   Resource: {0}", resName.Replace(".resources", ""))
       End Sub
    End Module
  • You identify the resource set by its resource file name (along with its optional namespace) and its file extension rather than by its namespace and root file name alone. For example, this exception is thrown if the neutral culture's resource set is named GlobalResources and you supply a value of GlobalResources.resources (instead of GlobalResources) to the baseName parameter of the ResourceManager.ResourceManager(String, Assembly) constructor.

  • The culture-specific resource set that is identified in a method call cannot be found, and the fallback resource set cannot be loaded. For example, if you create satellite assemblies for the English (United States) and Russia (Russian) cultures but you fail to provide a resource set for the neutral culture, this exception is thrown if your app's current culture is English (Great Britain).

MissingManifestResourceException uses the HRESULT COR_E_MISSINGMANIFESTRESOURCE, which has the value 0x80131532.

MissingManifestResourceException uses the default Equals implementation, which supports reference equality.

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


We recommend that you include a neutral set of resources in your main assembly, so your app won't fail if a satellite assembly is unavailable.

Universal Windows Platform (UWP) apps

UWP apps deploy resources for multiple cultures, including the neutral culture, in a single package resource index (.pri) file. As a result, in a UWP app, if resources for the preferred culture cannot be found, the MissingManifestResourceException is thrown under either of the following conditions:

  • The app does not include a .pri file, or the .pri file could not be opened.

  • The app's .pri file does not contain a resource set for the given root name.



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

MissingManifestResourceException(SerializationInfo, StreamingContext)

Initializes a new instance of the MissingManifestResourceException class from serialized data.


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

MissingManifestResourceException(String, Exception)

Initializes a new instance of the MissingManifestResourceException 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 a message that describes the current exception.

(Inherited from Exception)

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)



Determines whether the specified object is equal to the current object.

(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)
GetObjectData(SerializationInfo, StreamingContext)

When overridden in a derived class, sets the SerializationInfo with information about the exception.

(Inherited from Exception)

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)

Applies to

See also