将DataReader转换为CSV

导出DataReader为CSV (List).

源代码:

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public static List<string> ToCSV(this IDataReader dataReader, bool includeHeaderAsFirstRow, string separator)
{
List<string> csvRows = new List<string>();
StringBuilder sb = null;

if (includeHeaderAsFirstRow)
{
sb = new StringBuilder();
for (int index = 0; index < dataReader.FieldCount; index++)
{
if (dataReader.GetName(index) != null)
sb.Append(dataReader.GetName(index));

if (index < dataReader.FieldCount - 1)
sb.Append(separator);
}
csvRows.Add(sb.ToString());
}

while (dataReader.Read())
{
sb = new StringBuilder();
for (int index = 0; index < dataReader.FieldCount - 1; index++)
{
if (!dataReader.IsDBNull(index))
{
string value = dataReader.GetValue(index).ToString();
if (dataReader.GetFieldType(index) == typeof(String))
{
//If double quotes are used in value, ensure each are replaced but 2.
if (value.IndexOf("\"") >= 0)
value = value.Replace("\"", "\"\"");

//If separtor are is in value, ensure it is put in double quotes.
if (value.IndexOf(separator) >= 0)
value = "\"" + value + "\"";
}
sb.Append(value);
}

if (index < dataReader.FieldCount - 1)
sb.Append(separator);
}

if (!dataReader.IsDBNull(dataReader.FieldCount - 1))
sb.Append(dataReader.GetValue(dataReader.FieldCount - 1).ToString().Replace(separator, " "));

csvRows.Add(sb.ToString());
}
dataReader.Close();
sb = null;
return csvRows;
}

示例:

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List<string> rows = null;
using (SqlDataReader dataReader = command.ExecuteReader())
{
rows = dataReader.ToCSV(includeHeadersAsFirstRow, separator);
dataReader.Close();
}
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