#region 数据操作
/// <summary>
/// 去除字符串的所有空格。
/// </summary>
/// <param name="text">字符串</param>
/// <returns>字符串</returns>
public static string StringTrimAll( string text )
{
string _text = ToObjectString(text);
string returnText = String.Empty;
char[] chars = _text.ToCharArray();
for( int i=0;i<chars.Length;i++)
{
if( chars[i].ToString() != string.Empty)
returnText += chars[i].ToString();
}
return returnText;
}
/// <summary>
/// 去除数值字符串的所有空格。
/// </summary>
/// <param name="numricString">数值字符串</param>
/// <returns>String</returns>
public static string NumricTrimAll( string numricString )
{
string text = ToObjectString(numricString).Trim();
string returnText = String.Empty;
char[] chars = text.ToCharArray();
for( int i=0;i<chars.Length;i++)
{
if( chars[i].ToString() == "+" || chars[i].ToString() == "-" || IsDouble( chars[i].ToString()) )
returnText += chars[i].ToString();
}
return returnText;
}
/// <summary>
/// 在数组中查找匹配对象类型
/// </summary>
/// <param name="array">数组</param>
/// <param name="obj">对象</param>
/// <returns>Boolean</returns>
public static bool ArrayFind(Array array,object obj)
{
bool b = false;
foreach(object obj1 in array)
{
if(obj.Equals(obj1))
{
b = true;
break;
}
}
return b;
}
/// <summary>
/// 在数组中查找匹配字符串
/// </summary>
/// <param name="array">数组</param>
/// <param name="obj">对象</param>
/// <param name="unUpLower">是否忽略大小写</param>
/// <returns>Boolean</returns>
public static bool ArrayFind(Array array,string obj,bool unUpLower)
{
bool b = false;
foreach(string obj1 in array)
{
if(!unUpLower)
{
if(obj.Trim().Equals(obj1.ToString().Trim()))
{
b = true;
break;
}
}
else
{
if(obj.Trim().ToUpper().Equals(obj1.ToString().Trim().ToUpper()))
{
b = true;
break;
}
}
}
return b;
}
/// <summary>
/// 替换字符串中的单引号。
/// </summary>
/// <param name="inputString">字符串</param>
/// <returns>String</returns>
public static string ReplaceInvertedComma( string inputString )
{
return inputString.Replace("'","''");
}
/// <summary>
/// 判断两个字节数组是否具有相同值.
/// </summary>
/// <param name="bytea">字节1</param>
/// <param name="byteb">字节2</param>
/// <returns>Boolean</returns>
public static bool CompareByteArray(byte[] bytea,byte[] byteb)
{
if(null == bytea || null == byteb)
{
return false;
}
else
{
int aLength = bytea.Length;
int bLength = byteb.Length;
if(aLength != bLength)
return false;
else
{
bool compare = true;
for(int index = 0; index < aLength; index++)
{
if(bytea[index].CompareTo(byteb[index]) != 0)
{
compare = false;
break;
}
}
return compare;
}
}
}
/// <summary>
/// 日期智能生成。
/// </summary>
/// <param name="inputText">字符串</param>
/// <returns>DateTime</returns>
public static string BuildDate( string inputText )
{
try
{
return DateTime.Parse( inputText ).ToShortDateString();
}
catch
{
string text = NumricTrimAll( inputText );
string year = DateTime.Now.Year.ToString();
string month = DateTime.Now.Month.ToString();
string day = DateTime.Now.Day.ToString();
int length = text.Length;
if( length == 0 )
return String.Empty;
else
{
if( length<=2 )
day = text;
else if( length<=4 )
{
month = text.Substring(0,2);
day = text.Substring(2,length-2);
}
else if( length<=6 )
{
year = text.Substring(0,4);
month = text.Substring(4,length-4);
}
else if( length>6)
{
year = text.Substring(0,4);
month = text.Substring(4,2);
day = text.Substring(6,length-6);
}
try
{
return DateTime.Parse( year+"-"+month+"-"+day ).ToShortDateString();
}
catch
{
return String.Empty;
}
}
}
}
/// <summary>
/// 检查文件是否真实存在。
/// </summary>
/// <param name="path">文件全名（包括路径）。</param>
/// <returns>Boolean</returns>
public static bool IsFileExists(string path)
{
try
{
return File.Exists(path);
}
catch
{ return false; }
}
/// <summary>
/// 检查目录是否真实存在。
/// </summary>
/// <param name="path">目录路径.</param>
/// <returns>Boolean</returns>
public static bool IsDirectoryExists(string path)
{
try
{
return Directory.Exists(Path.GetDirectoryName(path));
}
catch
{ return false; }
}
/// <summary>
/// 查找文件中是否存在匹配行。
/// </summary>
/// <param name="fi">目标文件.</param>
/// <param name="lineText">要查找的行文本.</param>
/// <param name="lowerUpper">是否区分大小写.</param>
/// <returns>Boolean</returns>
public static bool FindLineTextFromFile(FileInfo fi,string lineText,bool lowerUpper)
{
bool b = false;
try
{
if(fi.Exists)
{
StreamReader sr=new StreamReader(fi.FullName);
string g = "";
do
{
g=sr.ReadLine();
if(lowerUpper)
{
if(ToObjectString(g).Trim() == ToObjectString(lineText).Trim())
{
b = true;
break;
}
}
else
{
if(ToObjectString(g).Trim().ToLower() == ToObjectString(lineText).Trim().ToLower())
{
b = true;
break;
}
}
}
while(sr.Peek()!=-1);
sr.Close();
}
}
catch
{ b =false; }
return b;
}
/// <summary>
/// 判断父子级关系是否正确。
/// </summary>
/// <param name="table">数据表。</param>
/// <param name="columnName">子键列名。</param>
/// <param name="parentColumnName">父键列名。</param>
/// <param name="inputString">子键值。</param>
/// <param name="compareString">父键值。</param>
/// <returns></returns>
public static bool IsRightParent(DataTable table,string columnName,string parentColumnName,string inputString,string compareString)
{
ArrayList array = new ArrayList();
SearchChild(array,table,columnName,parentColumnName,inputString,compareString);
return array.Count == 0;
}
// 内部方法
private static void SearchChild(ArrayList array,DataTable table,string columnName,string parentColumnName,string inputString,string compareString)
{
DataView view = new DataView(table);
view.RowFilter = parentColumnName+"='"+ReplaceInvertedComma(inputString.Trim())+"'";//找出所有的子类。
//查找表中的数据的ID是否与compareString相等，相等返回 false;不相等继续迭代。
for(int index = 0 ;index < view.Count;index ++)
{
if(Utility.ToObjectString(view[index][columnName]).ToLower() == compareString.Trim().ToLower())
{
array.Add("1");
break;
}
else
{
SearchChild(array,table,columnName,parentColumnName,Utility.ToObjectString(view[index][columnName]),compareString);
}
}
}
#endregion相关阅读 >>
更多相关阅读请进入《数据操作》频道 >>
C#高级编程(第11版) C# 7 & .NET Core 2.0（.NET开发经典名著）
作者:[美]克里斯琴·内格尔（Christian Nagel）著。出版时间：2019年3月。
