BindingSource.Filter 如何实现模糊查询

Question

希望通过Filter属性进行过滤
BindingSource.Filter = "%p";  //ok
BindingSource.Filter = "%p%";  //ok
BindingSource.Filter = "%p%c%";  //wrong，提示表达式错误
如果希望进行第三种方式的模糊查询，应该怎么办？

Answer 1

楼主不懂 BindingSource, 过滤不是由 bindingsource 来执行的,
是 bindingsource 照看的底层数据源实现的, bindingsource 只负责传递.
你的可能是 DataTable,你用 bindingsource 管理一个 List 数据源试试, 连基本的过滤都不支持.如果 DataTable 的过滤不够用, 你需要写自己的数据源.
实现众多接口.

Answer 2

我已经试过了，通配符在前或在后都没有问题，就是不能在中间，所以如果想查"p1c","p222c","pc"这样的数据就有问题

Answer 3

刚才用Reflector看了下微软的实现，可以看出来的确不允许中间有通配符。
internal string AnalizePattern(string pat)
        {
            int length = pat.Length;
            char[] destination = new char[length + 1];
            pat.CopyTo(0, destination, 0, length);
            destination[length] = '\0';
            string str = null;
            char[] chArray2 = new char[length + 1];
            int num3 = 0;
            int num4 = 0;
            int index = 0;
            while (index < length)
            {
                if ((destination[index] == '*') || (destination[index] == '%'))
                {
                    while (((destination[index] == '*') || (destination[index] == '%')) && (index < length))
                    {
                        index++;
                    }
                    if (((index < length) && (num3 > 0)) || (num4 >= 2))
                    {
                        throw new Exception("ExprException.InvalidPattern(pat);");
                    }
                    num4++;
                }
                else if (destination[index] == '[')
                {
                    index++;
                    if (index >= length)
                    {
                        throw new Exception("ExprException.InvalidPattern(pat);");
                    }
                    chArray2[num3++] = destination[index++];
                    if (index >= length)
                    {
                        throw new Exception("ExprException.InvalidPattern(pat);");
                    }
                    if (destination[index] != ']')
                    {
                        throw new Exception("ExprException.InvalidPattern(pat);");
                    }
                    index++;
                }
                else
                {
                    chArray2[num3++] = destination[index];
                    index++;
                }
            }
            str = new string(chArray2, 0, num3);
            if (num4 == 0)
            {
                kind = 4;
                return str;
            }
            if (num3 > 0)
            {
                if ((destination[0] == '*') || (destination[0] == '%'))
                {
                    if ((destination[length - 1] == '*') || (destination[length - 1] == '%'))
                    {
                        kind = 3;
                        return str;
                    }
                    kind = 2;
                    return str;
                }
                kind = 1;
                return str;
            }
            kind = 5;
            return str;
        }

Answer 4

不会死循环，在SQL里面能够正确执行。

Answer 5

没有更简便的方法了吗  filter是否可以？