| id | 层级视图项标识符。 |
| sampleIndex | 合并样本索引。 |
string 返回与特定项样本关联的调用栈。如果调用栈为空或是如果方法不成功，则返回空字符串。
获取与特定项样本关联的调用栈。
为特定性能分析器标记（如 GC.Alloc）启用了调用栈收集模式时，性能分析器会将调用栈写入数据流中。调用栈指的是指令指针堆栈。
指令指针可以解析为函数名称，而这些函数名称可以用于标识源代码中的样本起源。
ResolveItemCallstack 以字符串的形式获取调用栈。每行都表示一个函数调用。
**注意：**
仅当在编辑器中进行性能分析时，才能解析调用栈。请注意，域重新加载可以使托管调用栈无效。例如，当两个后续 EnterPlaymode 脚本重新加载时。
另请参阅：GetItemMergedSamplesCount、ResolveItemCallstack。
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