C#敏感关键词过滤代码

System.Text.StringBuildersb=

new

System.Text.StringBuilder(text.Length);

string

filterText=

"需要过滤的脏字以|分开"

;

//脏字可根据自己的方式用分隔符

string

[]filterData=filterText.Split(

'|'

);

foreach

(varitem

in

filterData)

{

char

value=item[0];

if

(dicList.ContainsKey(value))

dicList[value].Add(item);

else

dicList.Add(value,

new

List<

string

>(){item});

}

int

count=text.Length;

for

(

int

i=0;i<count;i++)

{

char

word=text[i];

if

(dicList.ContainsKey(word))

//如果在字典表中存在这个key

{

int

num=0;

//是否找到匹配的关键字1找到0未找到

vardata=dicList[word].OrderBy(g=>g.Length);

//把该key的字典集合按字符数排序(方便下面从少往多截取字符串查找)

foreach

(varwordbook

in

data)

{

if

(i+wordbook.Length<=count)

//如果需截取的字符串的索引小于总长度则执行截取

{

string

result=text.Substring(i,wordbook.Length);

//根据关键字长度往后截取相同的字符数进行比较

if

(result==wordbook)

{

num=1;

sb.Append(GetString(result));

i=i+wordbook.Length-1;

//比较成功同时改变i的索引

break

;

}

}

}

if

(num==0)

sb.Append(word);

}

else

sb.Append(word);

}

return

sb.ToString();

}

///<summary>

///替换星号

///</summary>

///<paramname="value"></param>

///<returns></returns>

private

static

string

GetString(

string

value)

{

string

starNum=

string

.Empty;

for

(

int

i=0;i<value.Length;i++)

{

starNum+=

"*"

;

}

return

starNum;

}

//该代码片段来自于:http://www.sharejs.com/codes/csharp/5486