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OpCodes.Ldflda Field

Finds the address of a field in the object whose reference is currently on the evaluation stack.

[Visual Basic]
Public Shared ReadOnly Ldflda As OpCode
[C#]
public static readonly OpCode Ldflda;
[C++]
public: static OpCode Ldflda;
[JScript]
public static var Ldflda : OpCode;

Remarks

The following table lists the instruction's hexadecimal and Microsoft Intermediate Language (MSIL) assembly format, along with a brief reference summary:

Format Assembly Format Description
7C < T > ldflda field Pushes the address of field in a specified object onto the stack.

The stack transitional behavior, in sequential order, is:

  1. An object reference (or pointer) is pushed onto the stack.
  2. The object reference (or pointer) is popped from the stack; the address of the specified field in the object is found.
  3. The address stored in the field is pushed onto the stack.

The ldflda instruction pushes the address of a field located in an object onto the stack. The object must be on the stack as an object reference (type O), a managed pointer (type &), an unmanaged pointer (type natural int), a transient pointer (type *), or an instance of a value type. The use of an unmanaged pointer is not permitted in verifiable code. The object's field is specified by a metadata token that must refer to a field member.

The value returned by ldflda is a managed pointer (type &) unless the object is pushed onto the stack as an unmanaged pointer, in which case the return address is also an unmanaged pointer (type natural int).

The ldflda instruction can be preceded by either or both of the Unaligned and Volatile prefixes.

InvalidOperationException is thrown if the object is not within the application domain from which it is being accessed. The address of a field that is not inside the accessing application domain cannot be loaded.

NullReferenceException is thrown if the object is null and the field is not static.

MissingFieldException is thrown if the specified field is not found in the metadata. This is typically checked when Microsoft Intermediate Language (MSIL) instructions are converted to native code, not at run time.

The following Emit constructor overload can use the ldflda opcode:

  • ILGenerator.Emit(OpCode, FieldInfo)

Requirements

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

See Also

OpCodes Class | OpCodes Members | System.Reflection.Emit Namespace

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