c# 统计顺序串中出现的字符

Question

public SqStringClass CharStr(string cstr)
{
int i,j;
SqStringClass mystr = new SqStringClass();
for (i = 0; i <= cstr.Length - 1; i++)
{
for (j = 1; j <= cstr.Length; j++)
{
if (cstr[j] != cstr[i])
{

mystr += cstr[j].ToString;
}

            }
        }

    }
            请问怎么改，大神们，帮帮忙，谢谢

Answer 1

先把你的意图说清楚，你写代码是干嘛呢，cstr跟自己比较啥呢