C#：文件、文件夹特别操作

1、过滤特殊字符

public class CharService:IDisposable
{
private List<char> _invalidChars;
public CharService()
{
_invalidChars = new List<char>();
_invalidChars.AddRange(Path.GetInvalidFileNameChars());
_invalidChars.AddRange(Path.GetInvalidPathChars());
}

/// <summary>
/// 特殊字符过滤
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
public string SplitStringInvaild(string str,bool isLower=true)
{
str = ToDBC(str);
StringBuilder sb = new StringBuilder();
foreach (char c in str)
{
if (_invalidChars.Contains(c))
continue;

if(isLower)
sb.Append(ToLower(c));
else
sb.Append(c);
}
str = sb.ToString().Trim();
if (isLower)
{
if (str.Substring(str.Length-1,1)==".")
{
str = str.Substring(0, str.Length - 1);
}
}
return str;
}

public static char ToLower(char c)
{
if (('A' <= c) && (c <= 'Z'))
{
c = (char)(c | ' ');
}
return c;
}

public static String ToDBC(String input)
{
char[] c = input.ToCharArray();
for (int i = 0; i < c.Length; i++)
{
if (c[i] == 12288)
{
c[i] = (char)32;
continue;
}
if (c[i] > 65280 && c[i] < 65375)
c[i] = (char)(c[i] - 65248);
}
return new String(c);
}

public void Dispose()
{
_invalidChars = null;
}
}

View Code

 2、将DataTable数据保存为.csv文件

private bool DataTableToCsv(System.Data.DataTable tb, string FileName)
{
bool Export = false;
TextWriter writer = null;
try
{
string text = String.Empty;
// 使用指定编码和缓冲区大小，为指定路径上的指定文件初始化 StreamWriter 类的新实例。
// 如果该文件存在，则可以将其覆盖或向其追加。如果该文件不存在，则此构造函数将创建一个新文件。
writer = new StreamWriter(FileName, false, Encoding.UTF8);

// 取得列的个数
int count = tb.Columns.Count;
string[] fields = new string[count];
// 循环添加列名
for (int i = 0; i < count; i++)
{
DataColumn column = tb.Columns[i];

fields[i] = column.ColumnName;

}
text = string.Join(",", fields);
writer.WriteLine(text);
// 遍历行
foreach (DataRow row in tb.Rows)
{
// 给每一行添加列单元
for (int i = 0; i < count; i++)
{
if (row[i] == null)
{
fields[i] = String.Empty;
continue;
}
if (row[i] == DBNull.Value)
{
fields[i] = String.Empty;
continue;
}
string field = row[i].ToString();
// CSV格式有规定,比如,如果字段中有逗号、双引号、回车换行符、前或后置空格,
// 必须把字段用双引号扩起来,如果文本中有双引号，必须用两个双引号替换
field = field.Replace("\"", "\"\"");
if (field.IndexOf(',') >= 0)
{
fields[i] = string.Format("\"{0}\"", field);
continue;
}
if (field.IndexOf('\r') >= 0)
{
fields[i] = string.Format("\"{0}\"", field);
continue;
}
if (field.IndexOf('\n') >= 0)
{
fields[i] = string.Format("\"{0}\"", field);
continue;
}
if (field.IndexOf('\"') >= 0)
{
fields[i] = string.Format("\"{0}\"", field);
continue;
}
if (field != field.Trim())
{
fields[i] = string.Format("\"{0}\"", field);
continue;
}
fields[i] = (i == 3) ? DateTime.Parse(row[i].ToString()).ToString("yyyy/MM/dd HH:mm:ss") : row[i].ToString();
}
text = string.Join(",", fields);
writer.WriteLine(text);
}
_logServ.Debug("导出成功");
//Console.WriteLine("导出成功", "提示");
Export = true;
}
catch (Exception ex)
{
_logServ.Error("导出失败" + ex.Message);
// Console.WriteLine("导出失败" + ex.Message, "提示");
Export = false;
}
finally
{
if (writer != null)
{
writer.Close();
}
}
return Export;
}

View Code

 3、+过滤掉非法字符

/// <summary>
/// 过滤掉非法字符和点字符
/// </summary>
/// <param name="directoryName"></param>
/// <returns></returns>
public String DirectoryNameFilter(String directoryName)
{
string invalidChars = "\\/:*?\"<>|.";    //自定义非法字符（比系统的多了个.）
foreach (char c in invalidChars)
{
directoryName.Replace(c.ToString(), string.Empty);
}
return directoryName;
}

/// <summary>
/// 过滤掉非法字符
/// </summary>
/// <param name="name"></param>
/// <returns></returns>
public String NameFilter(String name)
{
string invalidChars = "\\/:*?\"<>|";    //自定义非法字符（比系统的多了个.）
foreach (char c in invalidChars)
{
name.Replace(c.ToString(), string.Empty);
}
return name;
}

View Code

 4、计算文件夹大小

#region 计算文件夹大小

/// <summary>
/// 计算文件夹大小
/// </summary>
/// <param name="dirPath">文件夹</param>
/// <returns></returns>
public long CalculateDirSize(string dirPath)
{
long sumSize = 0;
try
{
if (!Directory.Exists(dirPath))
{
DirectoryInfo dirInfo = new DirectoryInfo(dirPath);
FileInfo[] files = dirInfo.GetFiles();
foreach (FileInfo fInfo in files)
{
sumSize += fInfo.Length;
}
DirectoryInfo[] dirs = dirInfo.GetDirectories();
foreach (DirectoryInfo dInfo in dirs)
{
sumSize += CalculateDirSize(dInfo.FullName);
}
}
}
catch (Exception ex)
{
LogHelper.Instance.Error("计算文件夹大小(" + dirPath + ")出错：" + ex.Message);
}
return sumSize;
}

View Code

 

转载于:https://www.cnblogs.com/shenchao/p/5431163.html

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