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OpCodes.Ldind_Ref Field

Loads an object reference as a type O (object reference) onto the evaluation stack indirectly.

[Visual Basic]
Public Shared ReadOnly Ldind_Ref As OpCode
[C#]
public static readonly OpCode Ldind_Ref;
[C++]
public: static OpCode Ldind_Ref;
[JScript]
public static var Ldind_Ref : 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
50 ldind.ref Loads the object reference at address addr onto the stack as a type O

The stack transitional behavior, in sequential order, is:

  1. An address is pushed onto the stack.
  2. The address is popped from the stack; the object reference located at the address is fetched.
  3. The fetched reference is pushed onto the stack.

The ldind.ref instruction indirectly loads the object reference the specified address (of type natural int, &, or *) onto the stack as type O.

All of the ldind instructions are shortcuts for a Ldobj instruction that specifies the corresponding built-in value class.

Note that integer values of less than 4 bytes are extended to int32 (not natural int) when they are loaded onto the evaluation stack. Floating-point values are converted to F type when loaded onto the evaluation stack.

Correctly-formed Microsoft Intermediate Language (MSIL) ensures that the ldind instructions are used in a manner consistent with the type of the pointer.

The address initially pushed onto the stack must be aligned to the natural size of objects on the machine or a NullReferenceException can occur (see the Unaligned prefix instruction for preventative measures). The results of all MSIL instructions that return addresses (for example, Ldloca and Ldarga) are safely aligned. For datatypes larger than 1 byte, the byte ordering is dependent on the target CPU. Code that depends on byte ordering might not run on all platforms.

NullReferenceException can be thrown if an invalid address is detected.

The following Emit constructor overload can use the ldind.ref opcode:

  • ILGenerator.Emit(OpCode)

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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