本文整理汇总了C#中System.Data.DataTableReader.GetChars方法的典型用法代码示例。如果您正苦于以下问题：C# DataTableReader.GetChars方法的具体用法？C# DataTableReader.GetChars怎么用？C# DataTableReader.GetChars使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。
在下文中一共展示了DataTableReader.GetChars方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: Main
//引入命名空间
using System;
using System.Data;
using System.IO;
class Class1
{
static void Main()
{
DataTable table = new DataTable();
table.Columns.Add("FileName", typeof(string));
table.Columns.Add("Data", typeof(char[]));
table.Rows.Add(new object[] { "File1.txt", "0123456789ABCDEF".ToCharArray() });
table.Rows.Add(new object[] { "File2.txt", "0123456789ABCDEF".ToCharArray() });
DataTableReader reader = new DataTableReader(table);
TestGetChars(reader, 7);
}
private static void TestGetChars(DataTableReader reader, int bufferSize)
{
// The filename is in column 0, and the contents are in column 1.
const int FILENAME_COLUMN = 0;
const int DATA_COLUMN = 1;
char[] buffer;
long offset;
int charsRead = 0;
string fileName;
int currentBufferSize = 0;
while (reader.Read())
{
// Reinitialize the buffer size and the buffer itself.
currentBufferSize = bufferSize;
buffer = new char[bufferSize];
// For each row, write the data to the specified file.
// First, verify that the FileName column isn't null.
if (!reader.IsDBNull(FILENAME_COLUMN))
{
// Get the file name, and create a file with
// the supplied name.
fileName = reader.GetString(FILENAME_COLUMN);
// Start at the beginning.
offset = 0;
using (StreamWriter outputStream =
new StreamWriter(fileName, false))
{
try
{
// Loop through all the characters in the input field,
// incrementing the offset for the next time. If this
// pass through the loop reads characters, write them to
// the output stream.
do
{
charsRead = (int)reader.GetChars(DATA_COLUMN, offset,
buffer, 0, bufferSize);
if (charsRead > 0)
{
outputStream.Write(buffer, 0, charsRead);
offset += charsRead;
}
} while (charsRead > 0);
}
catch (Exception ex)
{
Console.WriteLine(fileName + ": " + ex.Message);
}
}
}
}
Console.WriteLine("Press Enter key to finish.");
Console.ReadLine();
}
}