要将DataTable转换为IDataReader,可以使用一个自定义的类来实现。以下是一个简单的示例:
using System;
using System.Data;
public class DataTableReader : IDataReader
{
private DataTable _table;
private int _rowIndex;
public DataTableReader(DataTable table)
{
_table = table;
_rowIndex = -1;
}
public void Close()
{
_table = null;
}
public int Depth
{
get { return 0; }
}
public DataTable GetSchemaTable()
{
return null;
}
public bool IsClosed
{
get { return _table == null; }
}
public bool NextResult()
{
return false;
}
public bool Read()
{
if (_rowIndex >= _table.Rows.Count - 1)
return false;
_rowIndex++;
return true;
}
public int RecordsAffected
{
get { return 0; }
}
public object GetValue(int i)
{
return _table.Rows[_rowIndex][i];
}
public bool GetBoolean(int i)
{
return Convert.ToBoolean(GetValue(i));
}
public byte GetByte(int i)
{
return Convert.ToByte(GetValue(i));
}
public long GetBytes(int i, long fieldOffset, byte[] buffer, int bufferoffset, int length)
{
throw new NotImplementedException();
}
public char GetChar(int i)
{
return Convert.ToChar(GetValue(i));
}
public long GetChars(int i, long fieldoffset, char[] buffer, int bufferoffset, int length)
{
throw new NotImplementedException();
}
public IDataReader GetData(int i)
{
throw new NotImplementedException();
}
public string GetDataTypeName(int i)
{
return _table.Columns[i].DataType.Name;
}
public DateTime GetDateTime(int i)
{
return Convert.ToDateTime(GetValue(i));
}
public decimal GetDecimal(int i)
{
return Convert.ToDecimal(GetValue(i));
}
public double GetDouble(int i)
{
return Convert.ToDouble(GetValue(i));
}
public Type GetFieldType(int i)
{
return _table.Columns[i].DataType;
}
public float GetFloat(int i)
{
return Convert.ToSingle(GetValue(i));
}
public Guid GetGuid(int i)
{
return Guid.Parse(GetValue(i).ToString());
}
public short GetInt16(int i)
{
return Convert.ToInt16(GetValue(i));
}
public int GetInt32(int i)
{
return Convert.ToInt32(GetValue(i));
}
public long GetInt64(int i)
{
return Convert.ToInt64(GetValue(i));
}
public string GetName(int i)
{
return _table.Columns[i].ColumnName;
}
public int GetOrdinal(string name)
{
return _table.Columns[name].Ordinal;
}
public string GetString(int i)
{
return Convert.ToString(GetValue(i));
}
public int GetValues(object[] values)
{
int count = Math.Min(values.Length, _table.Columns.Count);
for (int i = 0; i< count; i++)
values[i] = GetValue(i);
return count;
}
public bool IsDBNull(int i)
{
return GetValue(i) == DBNull.Value;
}
public object this[string name]
{
get { return GetValue(GetOrdinal(name)); }
}
public object this[int i]
{
get { return GetValue(i); }
}
}
这个类实现了IDataReader接口,并使用DataTable作为数据源。要使用它,只需将DataTable对象传递给构造函数即可:
DataTable table = new DataTable();
// 添加列和数据到DataTable
DataTableReader reader = new DataTableReader(table);
现在,您可以使用reader对象读取DataTable中的数据,就像使用任何其他IDataReader对象一样。
请注意,这个示例仅供参考,您可能需要根据您的具体需求对其进行修改和优化。
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