dataset 中将 将2进制数组列的数据 转换成文件 和 从文件中 转换到 dataset 方法

///将2进制数组转换成文件

/// </summary>

/// <param name="psPath">路径+文本文件名字</param>

/// <param name="ds">数据源</param>

/// <param name="row">行号</param>

/// <param name="col">列名称</param>

private void tofilebyte(string psPath,DataSet ds,int row,string col)

{

FileStream fileStream = new FileStream(psPath , FileMode.OpenOrCreate, FileAccess.Write);

BinaryWriter binaryWriter = new BinaryWriter(fileStream);

Byte[] byteBLOBData = new Byte[0];

if(ds.Tables[0].Rows[row][col] != System.DBNull.Value)

byteBLOBData = (Byte[])(ds.Tables[0].Rows[row][col]);

binaryWriter.Write(byteBLOBData);

binaryWriter.Flush();

binaryWriter.Close();

fileStream.Close();

}

//转换成2进制数组 导入到dataset 直接赋给 dataset 对应列类型System.Byte[]

/// <summary>

/// 根据路径从文本文件中 取数

/// </summary>

/// <param name="Filename">路径+表名称</param>

/// <returns>Image类型数据</returns>

public static byte[] GetFileBytes(string Filename)

{

if (Filename == "")

return null;

FileStream fileStream = new FileStream(Filename, FileMode.Open, FileAccess.Read);

BinaryReader binaryReader = new BinaryReader(fileStream);

byte[] fileBytes = binaryReader.ReadBytes((int)fileStream.Length);

binaryReader.Close();

fileStream.Close();

return fileBytes;

}