如何剃出数组里相等的数据,只保留一个!?

Question

arr[] ={1,2,3,4,5,6,7,8,9,10,1,2,5,8,19,20}
怎么将数组里的相等的数据只保留一个
arr[]={1,2,3,4,5,6,7,8,9,10,19,20}

Answer 1

Int32[] arr ={1,2,3,4,5,6,7,8,9,10,1,2,5,8,19,20};
ArrayList al = new ArrayList();
for(int i=0;i<arr.Length;i++)
{
if(!al.Contains(arr[i]))
{
al.Add(arr[i]);
}
}
Object[] arr1=al.ToArray();

Answer 2

int[] arr = new int[] {1,2,3,4,5,6,7,8,9,10,1,2,5,8,19,20};
ArrayList test = new ArrayList();
for(int i =0;arr.Length>i;i++)
{ if(!test.Contains(arr[i]))
{
test.Add(arr[i]);
}   
}
object[] o ;
o = test.ToArray();
string a="";
for(int iii =0;iii<o.Length;iii++)
a+=o[iii];
textBox1.Text =a;