Asp.Net中类型的转换类有哪些

发布时间：2020-12-09 17:28:32 来源：亿速云阅读：143 作者：Leah 栏目：开发技术

本篇文章为大家展示了Asp.Net中类型的转换类有哪些，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。

具体方法如下

 /// <summary>
 /// 类型转换类
 /// 处理数据库获取字段为空的情况
 /// </summary>
 public static class DBConvert
 {
  #region------------------ToInt32类型转换------------------
  /// <summary>
  /// 读取数据库中字符串并转换成Int32
  /// 为空时返回0
  /// </summary>
  /// <param name="obj">object类型的值</param>
  /// <returns>Int32类型</returns>
  public static int ToInt32(object obj)
  {
   int result = 0;
   if (IsInt(Convert.ToString(obj)))
   {
    result = Convert.ToInt32(obj);
   }
   else if (obj != null && obj is Enum) //处理非null值类型时(或者枚举)
   {
    result = ((IConvertible)obj).ToInt32(null);
   }
   return result;
  }
  /// <summary>
  /// 读取数据库中字符串并转换成Int32
  /// 为空时返回0
  /// </summary>
  /// <param name="str">string类型的值</param>
  /// <returns>Int32类型</returns>
  public static int ToInt32(string str)
  {
   int result = 0;
   if (IsInt(str))
   {
    result = Convert.ToInt32(str);
   }
   return result;
  }
  /// <summary>
  /// 判断一个字符串是否属于Int类型
  /// 如果是的返回true，如果不是返回false
  /// </summary>
  /// <param name="str">string类型的值</param>
  /// <returns>true：是Int的字符串(即可以转换成Int类型)，false：不是Int类型的字符串</returns>
  public static bool IsInt(string str)
  {
   bool result = false;
   if (str != "" && str!=null)
   {
    Regex reg = new Regex("^[0-9]*$");
    if (reg.IsMatch(str))
    {
     result = true;
    }
   }
   return result;
  }
  #endregion
  #region------------------ToString类型转换------------------
  /// <summary>
  /// 读取数据库中字符串并转换成string
  /// </summary>
  /// <param name="obj">object类型的值</param>
  /// <returns>string类型</returns>
  public static string ToString(object obj)
  {
   string result = "";
   if (obj != null)
   {
    result = Convert.ToString(obj);
   }
   return result;
  }
  #endregion
  #region------------------ToDouble类型转换------------------
  /// <summary>
  /// 判断一个字符串是否属于Double类型(包括负浮点型)
  /// 如果是的返回true，如果不是返回false
  /// </summary>
  /// <param name="str">string类型的值</param>
  /// <returns>true：是Double的字符串(即可以转换成Double类型)，false：不是Double类型的字符串</returns>
  public static bool IsDouble(string str)
  {
   bool result = false;
   if (str != "" && str != null)
   {
    Regex reg = new Regex(@"^(-&#63;\d+)(\.\d+)&#63;$");
    if (reg.IsMatch(str))
    {
     result = true;
    }
   }
   return result;
  }
  /// <summary>
  /// 读取数据库中字符串并转换成Int32
  /// 为空时返回0
  /// </summary>
  /// <param name="obj">object类型的值</param>
  /// <returns>Int32类型</returns>
  public static double ToDouble(object obj)
  {
   double result = 0.0;
   if (IsDouble(Convert.ToString(obj)))
   {
    result = Convert.ToDouble(obj);
   }
   else if (obj != null && obj is Enum) //处理枚举
   {
    result = ((IConvertible)obj).ToDouble(null);
   }
   return result;
  }
  /// <summary>
  /// 读取数据库中字符串并转换成Int32
  /// 为空时返回0
  /// </summary>
  /// <param name="str">string类型的值</param>
  /// <returns>Int32类型</returns>
  public static double ToDouble(string str)
  {
   double result = 0.0;
   if (IsDouble(str))
   {
    result = Convert.ToDouble(str);
   }
   return result;
  }
  #endregion
  #region------------------ToDateTime类型转换------------------
  /// <summary>
  /// 判断时间格式是否是时间类型
  /// 如23:10
  /// </summary>
  /// <param name="str">要判断的字符串</param>
  /// <returns>true：是时间类型的字符串(即可以转换成时间类型)，false：不是时间类型的字符串</returns>
  public static bool isDateTime(string str)
  {
   bool result = false;
   if (str != "" && str != null)
   {
    Regex reg = new Regex("(([01]\\d)|(2[0-3])):[0-5]\\d");
    if (reg.IsMatch(str))
    {
     result = true;
    }
   }
   return result;
  }
  #endregion
 }
}
//"^\d+(\.\d+)&#63;$"　　//非负浮点数（正浮点数 + 0）
//"^(([0-9]+\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\.[0-9]+)|([0-9]*[1-9][0-9]*))$"　　//正浮点数
//"^((-\d+(\.\d+)&#63;)|(0+(\.0+)&#63;))$"　　//非正浮点数（负浮点数 + 0）
//"^(-(([0-9]+\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\.[0-9]+)|([0-9]*[1-9][0-9]*)))$"　　//负浮点数
//"^(-&#63;\d+)(\.\d+)&#63;$"　　//浮点数

好了，Asp.Net类型转换类(通用类)代码分享到此结束。

下面看下ASP.NET页面数据验证通用类的实例代码。

public class PageValidate
{
private static Regex RegPhone = new Regex("^[0-9]+[-]&#63;[0-9]+[-]&#63;[0-9]$");
private static Regex RegNumber = new Regex("^[0-9]+$");
private static Regex RegNumberSign = new Regex("^[+-]&#63;[0-9]+$");
private static Regex RegDecimal = new Regex("^[0-9]+[.]&#63;[0-9]+$");
private static Regex RegDecimalSign = new Regex("^[+-]&#63;[0-9]+[.]&#63;[0-9]+$"); //等价于^[+-]&#63;\d+[.]&#63;\d+$
private static Regex RegEmail = new Regex("^[\\w-]+@[\\w-]+\\.(com|net|org|edu|mil|tv|biz|info)$");//w 英文字母或数字的字符串，和 [a-zA-Z0-9] 语法一样
private static Regex RegCHZN = new Regex("[\u4e00-\u9fa5]");
public PageValidate()
{
}
//数字字符串检查#region 数字字符串检查
public static bool IsPhone(string inputData)
{
Match m = RegPhone.Match(inputData);
return m.Success;
}
/**//// <summary>
/// 检查Request查询字符串的键值，是否是数字，最大长度限制
/// </summary>
/// <param name="req">Request</param>
/// <param name="inputKey">Request的键值</param>
/// <param name="maxLen">最大长度</param>
/// <returns>返回Request查询字符串</returns>
public static string FetchInputDigit(HttpRequest req, string inputKey, int maxLen)
{
string retVal = string.Empty;
if(inputKey != null && inputKey != string.Empty)
{
retVal = req.QueryString[inputKey];
if(null == retVal)
retVal = req.Form[inputKey];
if(null != retVal)
{
retVal = SqlText(retVal, maxLen);
if(!IsNumber(retVal))
retVal = string.Empty;
}
}
if(retVal == null)
retVal = string.Empty;
return retVal;
}
/**//// <summary>
/// 是否数字字符串
/// </summary>
/// <param name="inputData">输入字符串</param>
/// <returns></returns>
public static bool IsNumber(string inputData)
{
Match m = RegNumber.Match(inputData);
return m.Success;
}
/**//// <summary>
/// 是否数字字符串 可带正负号
/// </summary>
/// <param name="inputData">输入字符串</param>
/// <returns></returns>
public static bool IsNumberSign(string inputData)
{
Match m = RegNumberSign.Match(inputData);
return m.Success;
}
/**//// <summary>
/// 是否是浮点数
/// </summary>
/// <param name="inputData">输入字符串</param>
/// <returns></returns>
public static bool IsDecimal(string inputData)
{
Match m = RegDecimal.Match(inputData);
return m.Success;
}
/**//// <summary>
/// 是否是浮点数 可带正负号
/// </summary>
/// <param name="inputData">输入字符串</param>
/// <returns></returns>
public static bool IsDecimalSign(string inputData)
{
Match m = RegDecimalSign.Match(inputData);
return m.Success;
}
#endregion
//中文检测#region 中文检测
/**//// <summary>
/// 检测是否有中文字符
/// </summary>
/// <param name="inputData"></param>
/// <returns></returns>
public static bool IsHasCHZN(string inputData)
{
Match m = RegCHZN.Match(inputData);
return m.Success;
}
#endregion
//邮件地址#region 邮件地址
/**//// <summary>
/// 是否是浮点数 可带正负号
/// </summary>
/// <param name="inputData">输入字符串</param>
/// <returns></returns>
public static bool IsEmail(string inputData)
{
Match m = RegEmail.Match(inputData);
return m.Success;
}
#endregion
//其他#region 其他
/**//// <summary>
/// 检查字符串最大长度，返回指定长度的串
/// </summary>
/// <param name="sqlInput">输入字符串</param>
/// <param name="maxLength">最大长度</param>
/// <returns></returns>
public static string SqlText(string sqlInput, int maxLength)
{
if(sqlInput != null && sqlInput != string.Empty)
{
sqlInput = sqlInput.Trim();
if(sqlInput.Length > maxLength)//按最大长度截取字符串
sqlInput = sqlInput.Substring(0, maxLength);
}
return sqlInput;
}
/**//// <summary>
/// 字符串编码
/// </summary>
/// <param name="inputData"></param>
/// <returns></returns>
public static string HtmlEncode(string inputData)
{
return HttpUtility.HtmlEncode(inputData);
}
/**//// <summary>
/// 设置Label显示Encode的字符串
/// </summary>
/// <param name="lbl"></param>
/// <param name="txtInput"></param>
public static void SetLabel(Label lbl, string txtInput)
{
lbl.Text = HtmlEncode(txtInput);
}
public static void SetLabel(Label lbl, object inputObj)
{
SetLabel(lbl, inputObj.ToString());
}
//字符串清理
public static string InputText(string inputString, int maxLength)
{
StringBuilder retVal = new StringBuilder();
// 检查是否为空
if ((inputString != null) && (inputString != String.Empty))
{
inputString = inputString.Trim();
//检查长度
if (inputString.Length > maxLength)
inputString = inputString.Substring(0, maxLength);
//替换危险字符
for (int i = 0; i < inputString.Length; i++)
{
switch (inputString[i])
{
case '"':
retVal.Append("&quot;");
break;
case '<':
retVal.Append("&lt;");
break;
case '>':
retVal.Append("&gt;");
break;
default:
retVal.Append(inputString[i]);
break;
}
}
retVal.Replace("'", " ");// 替换单引号
}
return retVal.ToString();
}
/**//// <summary>
/// 转换成 HTML code
/// </summary>
/// <param name="str">string</param>
/// <returns>string</returns>
public static string Encode(string str)
{
str = str.Replace("&","&amp;");
str = str.Replace("'","''");
str = str.Replace("\"","&quot;");
str = str.Replace(" ","&nbsp;");
str = str.Replace("<","&lt;");
str = str.Replace(">","&gt;");
str = str.Replace("\n","<br>");
return str;
}
/**//// <summary>
///解析html成 普通文本
/// </summary>
/// <param name="str">string</param>
/// <returns>string</returns>
public static string Decode(string str)
{
str = str.Replace("<br>","\n");
str = str.Replace("&gt;",">");
str = str.Replace("&lt;","<");
str = str.Replace("&nbsp;"," ");
str = str.Replace("&quot;","\"");
return str;
}
public static string SqlTextClear(string sqlText)
{
if (sqlText == null)
{
return null;
}
if (sqlText == "")
{
return "";
}
sqlText = sqlText.Replace(",", "");//去除,
sqlText = sqlText.Replace("<", "");//去除<
sqlText = sqlText.Replace(">", "");//去除>
sqlText = sqlText.Replace("--", "");//去除--
sqlText = sqlText.Replace("'", "");//去除'
sqlText = sqlText.Replace("\"", "");//去除"
sqlText = sqlText.Replace("=", "");//去除=
sqlText = sqlText.Replace("%", "");//去除%
sqlText = sqlText.Replace(" ", "");//去除空格
return sqlText;
}
#endregion
//是否由特定字符组成#region 是否由特定字符组成
public static bool isContainSameChar(string strInput)
{
string charInput = string.Empty;
if (!string.IsNullOrEmpty(strInput))
{
charInput = strInput.Substring(0, 1);
}
return isContainSameChar(strInput, charInput, strInput.Length);
}
public static bool isContainSameChar(string strInput, string charInput, int lenInput)
{
if (string.IsNullOrEmpty(charInput))
{
return false;
}
else
{
Regex RegNumber = new Regex(string.Format("^([{0}])+$", charInput));
//Regex RegNumber = new Regex(string.Format("^([{0}]{{1}})+$", charInput,lenInput));
Match m = RegNumber.Match(strInput);
return m.Success;
}
}
#endregion
//检查输入的参数是不是某些定义好的特殊字符：这个方法目前用于密码输入的安全检查#region 检查输入的参数是不是某些定义好的特殊字符：这个方法目前用于密码输入的安全检查
/**//// <summary>
/// 检查输入的参数是不是某些定义好的特殊字符：这个方法目前用于密码输入的安全检查
/// </summary>
public static bool isContainSpecChar(string strInput)
{
string[] list = new string[] { "123456", "654321" };
bool result = new bool();
for (int i = 0; i < list.Length; i++)
{
if (strInput == list[i])
{
result = true;
break;
}
}
return result;
}
#endregion
}

上述内容就是Asp.Net中类型的转换类有哪些，你们学到知识或技能了吗？如果还想学到更多技能或者丰富自己的知识储备，欢迎关注亿速云行业资讯频道。

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