常用代码
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;
namespace ESales.Common
{
/// <summary>
/// 应用帮助类
/// </summary>
public class Utils
{
/// <summary>
/// 判断DataSet是否为空
/// </summary>
/// <param name="ds"></param>
/// <returns></returns>
public static bool IsEmptyDataSet(DataSet ds)
{
if (ds == null || ds.Tables.Count == 0 || ds.Tables[0].Rows.Count == 0)
{
return true;
}
else
{
return false;
}
}
#region 字符串操作
/// <summary>
/// 转换为Int数组
/// </summary>
/// <param name="strArray"></param>
/// <returns></returns>
public static int[] ToIntArray(string[] strArray)
{
if (strArray != null)
{
int[] intAry = new int[strArray.Length];
for (int i = 0; i < intAry.Length; i++)
{
intAry[i] = int.Parse(strArray[i]);
}
return intAry;
}
else
{
return new int[] { };
}
}
/// <summary>
/// 截取字符串
/// </summary>
/// <param name="text">要截取的源字符串</param>
/// <param name="maxLength">允许的最大字符串长度</param>
/// <param name="replace">要在结尾附加的字符串</param>
/// <param name="onDiffCharSet">是否开启中/英文字符集区分(开启时一个中文字符算两位，一个英文字符只算一位)</param>
/// <returns>返回截取后的字符串</returns>
public static string SubString(string text, int maxLength, string replace, bool onDiffCharSet)
{
string outString = string.Empty;
if (string.IsNullOrEmpty(replace))
{
replace = string.Empty;
}
if (!string.IsNullOrEmpty(text))
{
if (onDiffCharSet)
{
if (GetStringLength(text) <= maxLength)
{
outString = text;
}
else
{
string strTemp = text;
for (int i = text.Length; i >= 0; i--)
{
strTemp = strTemp.Substring(0, i);
if (GetStringLength(strTemp) <= maxLength)
{
outString = strTemp + replace;
break;
}
}
}
}
else
{
if (text.Length > maxLength)
{
outString = text.Substring(0, maxLength) + replace;
}
}
}
else
{
outString = replace;
}
return outString;
}
/// <summary>
/// 获取字符串的长度(中文字符算两位，英文字符算一位)
/// </summary>
/// <param name="text">要计算的源字符串</param>
/// <returns>返回整型的字符串的长度值</returns>
public static int GetStringLength(string text)
{
int length = 0;
if (!string.IsNullOrEmpty(text))
{
// 备注：使用 [\u4e00-\u9fa5] 替换时，只会替换中文字符，对于其它双
// 字节字符处理无效（中文标点也会忽略掉）
length = Regex.Replace(text, "[^\x00-\xff]", "zz", RegexOptions.IgnoreCase).Length;
}
return length;
}
#endregion
#region HTML编码转换
/// <summary>
/// 对HTML字符进行编码
/// </summary>
/// <param name="text"></param>
/// <returns></returns>
public static string HtmlEncode(string text)
{
if (string.IsNullOrEmpty(text))
{
return string.Empty;
}
else
{
return HttpUtility.HtmlEncode(text);
}
}
/// <summary>
/// 对HTML字符进行解码
/// </summary>
/// <param name="text"></param>
/// <returns></returns>
public static string HtmlDecode(string text)
{
if (string.IsNullOrEmpty(text))
{
return string.Empty;
}
else
{
return HttpUtility.HtmlDecode(text);
}
}
/// <summary>
/// 将文本格式转化为HTML格式, 如：\r\n 转换为 <br/>
/// </summary>
/// <param name="text"></param>
/// <returns></returns>
public static string Text2Html(string text)
{
if (string.IsNullOrEmpty(text))
{
return string.Empty;
}
else
{
StringBuilder strBuilder = new StringBuilder(text);
strBuilder.Replace(" ", " ");
strBuilder.Replace(" ", " ");//全角中文空格
strBuilder.Replace("\r\n", "<br/>");
strBuilder.Replace("\r", "<br/>");
strBuilder.Replace("\n", "<br/>");
return strBuilder.ToString();
}
}
/// <summary>
/// 将HTML格式转化为文本格式, 如：<br/> 转换为 \r\n
/// </summary>
/// <param name="html"></param>
/// <returns></returns>
public static string Html2Text(string html)
{
if (string.IsNullOrEmpty(html))
{
return string.Empty;
}
else
{
StringBuilder strBuilder = new StringBuilder(html);
strBuilder.Replace(" ", " ");
strBuilder.Replace(" ", " ");//全角中文空格
strBuilder.Replace("<br/>", "\r\n");
strBuilder.Replace("<br/>", "\r");
strBuilder.Replace("<br/>", "\n");
return strBuilder.ToString();
}
}
#endregion
#region Request & Session & Cookie & Web.Config 强类型值读取
public static T GetRequest<T>(string key, T defaultValue)
{
string value = HttpContext.Current.Request[key];
if (string.IsNullOrEmpty(value))
{
return defaultValue;
}
else
{
try
{
return (T)Convert.ChangeType(value, typeof(T));
}
catch
{
return defaultValue;
}
}
}
public static T GetSession<T>(string key, T defaultValue)
{
object value = HttpContext.Current.Session[key];
if (value == null)
{
return defaultValue;
}
else
{
try
{
return (T)Convert.ChangeType(value, typeof(T));
}
catch
{
return defaultValue;
}
}
}
public static T GetAppConfig<T>(string key, T defaultValue)
{
string value = ConfigurationManager.AppSettings[key];
if (string.IsNullOrEmpty(value))
{
return defaultValue;
}
else
{
try
{
return (T)Convert.ChangeType(value, typeof(T));
}
catch
{
return defaultValue;
}
}
}
#endregion
#region 页面帮助脚本
/// <summary>
/// 通过Script脚本在页面上显示提示信息
/// </summary>
/// <param name="page"></param>
/// <param name="message">提示信息</param>
public static void Alert(string message)
{
HttpContext.Current.Response.Write(string.Format(
"<script language=\"javascript\">alert(\"{0}\");</script>", message));
//page.ClientScript.RegisterClientScriptBlock(page.GetType(), page.UniqueID,
// string.Format("alert(\"{0}\");", message), true);
}
/// <summary>
/// 通过Script脚本在页面上显示提示信息, 并跳转到新的地址
/// </summary>
/// <param name="message">提示信息</param>
/// <param name="gotoUrl">要跳转的页</param>
public static void Alert(string message, string gotoUrl)
{
//page.ClientScript.RegisterClientScriptBlock(page.GetType(), page.UniqueID,
// string.Format("alert(\"{0}\");location.href=\"{1}\";", message, gotoUrl), true);
HttpContext.Current.Response.Write(string.Format(
"<script language=\"javascript\">alert(\"{0}\");location.href=\"{1}\";</script>", message, gotoUrl));
}
#endregion
#region 其他帮助方法
/// <summary>
/// 获取ASP.NET控件相应的HTML字符串表示
/// </summary>
/// <param name="c"></param>
/// <returns></returns>
public static string RenderHtmlOfControl(System.Web.UI.Control c)
{
System.Text.StringBuilder sb = new System.Text.StringBuilder();
System.IO.StringWriter writer = new System.IO.StringWriter(sb);
System.Web.UI.HtmlTextWriter htw = new System.Web.UI.HtmlTextWriter(writer);
c.RenderControl(htw);
return sb.ToString();
}
/// <summary>
/// 使用MD5加密字符串
/// </summary>
/// <param name="text">要加密的字符串</param>
/// <returns>加密后的字符串(32位大写字符)</returns>
public static string MD5(string text)
{
return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(text, "md5");
}
/// <summary>
/// 使用BASE64对文本进行编码
/// </summary>
/// <param name="text">要编码的字符串</param>
/// <returns></returns>
public static string Base64Encode(string text)
{
byte[] b = System.Text.Encoding.Default.GetBytes(text);
//转成 Base64 形式的 System.String
string outStr = Convert.ToBase64String(b);
return outStr;
}
/// <summary>
/// 使用BASE64对文本进行解码
/// </summary>
/// <param name="text">要解码的字符串</param>
/// <returns></returns>
public static string Base64Decode(string text)
{
byte[] c = Convert.FromBase64String(text);
string outStr = System.Text.Encoding.Default.GetString(c);
return outStr;
}
/// <summary>
/// 设置一个选择项, 其他被选中的项会取消选中状态
/// </summary>
/// <param name="list">要进行查找的LIST</param>
/// <param name="val">同List.Item[i].Value进行对比的值</param>
public static void SelecteItem(ListControl list, string val)
{
for (int i = 0; i < list.Items.Count; i++)
{
list.Items[i].Selected = false;
}
for (int i = 0; i < list.Items.Count; i++)
{
if (list.Items[i].Value == val)
{
list.Items[i].Selected = true;
return;
}
}
}
/// <summary>
/// 设置一个的选择项(可用于选择多个项)
/// </summary>
/// <param name="list">要进行查找的LIST</param>
/// <param name="val">同List.Item[i].Value进行对比的值</param>
/// <param name="cancel">是否取消已选中的项</param>
public static void SelectItem(ListControl list, string val, bool cancel)
{
for (int i = 0; i < list.Items.Count; i++)
{
if (list.Items[i].Value == val)
{
list.Items[i].Selected = true;
}
else
{
if (cancel)
{
list.Items[i].Selected = false;
}
}
}
}
#endregion
}//class Utils
}
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