过滤特殊字符 格式化字符型、日期型、布尔型

/// <summary>
/// 过滤特殊字符
/// </summary>
/// <param name="s"></param>
/// <returns></returns>
public static string String2Json(String s)
{
StringBuilder sb = new StringBuilder();
for (int i = 0; i < s.Length; i++)
{
char c = s.ToCharArray()[i];
switch (c)
{
case '\"':
sb.Append("\\\""); break;
case '\\':
sb.Append("\\\\"); break;
case '/':
sb.Append("\\/"); break;
case '\b':
sb.Append("\\b"); break;
case '\f':
sb.Append("\\f"); break;
case '\n':
sb.Append("\\n"); break;
case '\r':
sb.Append("\\r"); break;
case '\t':
sb.Append("\\t"); break;
default:
sb.Append(c); break;
}
}
return sb.ToString();
}

/// <summary>
/// 格式化字符型、日期型、布尔型
/// </summary>
/// <param name="str"></param>
/// <param name="type"></param>
/// <returns></returns>
public static string StringFormat(string str, Type type)
{
if (type == typeof(string))
{
str = String2Json(str);
str = "\"" + str + "\"";
}
else if (type == typeof(DateTime))
{
str = "\"" + str + "\"";
}
else if (type == typeof(Int32))
{
if (str.Trim() == "")
{
str = "\"" + str + "\"";
}
}
else if (type == typeof(bool))
{
str = str.ToLower();
}
return str;
}

 

/// <summary>
/// 过滤特殊字符
/// 如果字符串为空，直接返回。
/// </summary>
/// <param name="str">需要过滤的字符串</param>
/// <returns>过滤好的字符串</returns>
public static string FilterSpecial(this string str)
{
if (str == "")
{
return str;
}
else
{
str = str.Replace("'", "");
str = str.Replace("<", "");
str = str.Replace(">", "");
str = str.Replace("%", "");
str = str.Replace("'delete", "");
str = str.Replace("''", "");
str = str.Replace("\"\"", "");
str = str.Replace(",", "");
str = str.Replace(".", "");
str = str.Replace(">=", "");
str = str.Replace("=<", "");
str = str.Replace(";", "");
str = str.Replace("||", "");
str = str.Replace("[", "");
str = str.Replace("]", "");
str = str.Replace("&", "");
str = str.Replace("#", "");
str = str.Replace("/", "");
str = str.Replace("|", "");
str = str.Replace("?", "");
str = str.Replace(">?", "");
str = str.Replace("?<", "");
return str;
}
}