C#完美读取CSV
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/// <summary>
/// 将DataTable中数据写入到CSV文件中
/// </summary>
/// <param name="dt">提供保存数据的DataTable</param>
/// <param name="fileName">CSV的文件路径</param>
public static bool SaveCSV(DataTable dt, string fullPath)
{
try
{
FileInfo fi = new FileInfo(fullPath);
if (!fi.Directory.Exists)
{
fi.Directory.Create();
}
FileStream fs = new FileStream(fullPath, System.IO.FileMode.Create, System.IO.FileAccess.Write);
//StreamWriter sw = new StreamWriter(fs, System.Text.Encoding.Default);
StreamWriter sw = new StreamWriter(fs, System.Text.Encoding.UTF8);
string data = "";
//写出列名称
for (int i = 0; i < dt.Columns.Count; i++)
{
data += "\"" + dt.Columns[i].ColumnName.ToString() + "\"";
if (i < dt.Columns.Count - 1)
{
data += ",";
}
}
sw.WriteLine(data);
//写出各行数据
for (int i = 0; i < dt.Rows.Count; i++)
{
data = "";
for (int j = 0; j < dt.Columns.Count; j++)
{
string str = dt.Rows[i][j].ToString();
str = string.Format("\"{0}\"", str);
data += str;
if (j < dt.Columns.Count - 1)
{
data += ",";
}
}
sw.WriteLine(data);
}
sw.Close();
fs.Close();
return true;
}
catch
{
return false;
}
}
/// <summary>
/// 读取CSV文件到DataTable中
/// </summary>
/// <param name="filePath">CSV的文件路径</param>
/// <returns></returns>
public static DataTable ReadCSV(string filePath)
{
DataTable dt = new DataTable();
int lineNumber = 0;
using (CsvFileReader reader = new CsvFileReader(filePath))
{
CsvRow row = new CsvRow();
while (reader.ReadRow(row))
{
if (0 == lineNumber)
{
foreach (string s in row)
{
dt.Columns.Add(s.Replace("\"", ""));
}
}
else
{
int index = 0;
DataRow dr = dt.NewRow();
foreach (string s in row)
{
dr[index] = s.Replace("\"", "");
index++;
}
dt.Rows.Add(dr);
}
lineNumber++;
}
}
return dt;
}
public class CsvRow : List<string> { public string LineText { get; set; } } public class CsvFileReader : StreamReader { public CsvFileReader(Stream stream) : base(stream) { } public CsvFileReader(string filename) : base(filename) { } /// <summary> /// Reads a row of data from a CSV file /// </summary> /// <param name="row"></param> /// <returns></returns> public bool ReadRow(CsvRow row) { row.LineText = ReadLine(); if (String.IsNullOrEmpty(row.LineText)) return false; int pos = 0; int rows = 0; while (pos < row.LineText.Length) { string value; // Special handling for quoted field if (row.LineText[pos] == ‘"‘) { // Skip initial quote pos++; // Parse quoted value int start = pos; while (pos < row.LineText.Length) { // Test for quote character if (row.LineText[pos] == ‘"‘) { // Found one pos++; // If two quotes together, keep one // Otherwise, indicates end of value if (pos >= row.LineText.Length || row.LineText[pos] != ‘"‘) { pos--; break; } } pos++; } value = row.LineText.Substring(start, pos - start); value = value.Replace("\"\"", "\""); } else { // Parse unquoted value int start = pos; while (pos < row.LineText.Length && row.LineText[pos] != ‘,‘) pos++; value = row.LineText.Substring(start, pos - start); } // Add field to list if (rows < row.Count) row[rows] = value; else row.Add(value); rows++; // Eat up to and including next comma while (pos < row.LineText.Length && row.LineText[pos] != ‘,‘) pos++; if (pos < row.LineText.Length) pos++; } // Delete any unused items while (row.Count > rows) row.RemoveAt(rows); // Return true if any columns read return (row.Count > 0); } }
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