OpCodes.Ldelem_Ref 字段


将位于指定数组索引处的包含对象引用的元素作为 O 类型(对象引用)加载到计算堆栈的顶部。Loads the element containing an object reference at a specified array index onto the top of the evaluation stack as type O (object reference).

public: static initonly System::Reflection::Emit::OpCode Ldelem_Ref;
public static readonly System.Reflection.Emit.OpCode Ldelem_Ref;
 staticval mutable Ldelem_Ref : System.Reflection.Emit.OpCode
Public Shared ReadOnly Ldelem_Ref As OpCode 



下表列出了指令的十六进制和 Microsoft 中间语言(MSIL)程序集格式以及简短的参考摘要:The following table lists the instruction's hexadecimal and Microsoft Intermediate Language (MSIL) assembly format, along with a brief reference summary:

格式Format 程序集格式Assembly Format 说明Description
9A9A ldelem.refldelem.ref 使用在堆栈顶部 indexO 类型的对象引用来加载元素。Loads the element with an object reference at index onto the top of the stack as type O.

堆栈转换行为顺序如下:The stack transitional behavior, in sequential order, is:

  1. array 的对象引用推送到堆栈上。An object reference array is pushed onto the stack.

  2. 索引值 index 将被推送到堆栈上。An index value index is pushed onto the stack.

  3. index 和 @no__t 从堆栈中弹出;查找 array 位置 index 位置中存储的值。index and array are popped from the stack; the value stored at position index in array is looked up.

  4. 值推送到堆栈上。The value is pushed onto the stack.

@No__t-0 指令会在从零开始的一维 @no__t 数组中加载索引为 index (类型 native int)的元素的值,并将其放在堆栈顶部。The ldelem.ref instruction loads the value of the element with index index (type native int) in the zero-based one-dimensional array array and places it on the top of the stack. 数组是对象,因此由类型 O 的值表示。Arrays are objects and hence represented by a value of type O.

@No__t 的返回值为类型 O (对象引用)。The return value for ldelem.ref is type O (object reference).

如果 array 为 null 引用,则会引发 NullReferenceExceptionNullReferenceException is thrown if array is a null reference.

如果 array 不包含所需类型的元素,则会引发 ArrayTypeMismatchExceptionArrayTypeMismatchException is thrown if array does not hold elements of the required type.

如果 index 为负数或大于 array 的界限,则会引发 IndexOutOfRangeExceptionIndexOutOfRangeException is thrown if index is negative, or larger than the bound of array.

以下 @no__t 0 方法重载可以使用 @no__t 操作码:The following Emit method overload can use the ldelem.ref opcode:

  • ILGenerator.Emit(OpCode)ILGenerator.Emit(OpCode)