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                            ### Indexof(arr, value);
>找到返回索引，未找到返回-1
```
string[] arr = { "a", "b", "c" };
Array.IndexOf(arr, "a");
```
### Array.LastIndexOf
用于查找一維數組中的最后一個匹配元素。
```
int[] arr = { 1,2,3,4,5,6,7,1,2,3,1,2,3};
Array.LastIndexOf(arr, 3);//12
```

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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