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CollectionExtensions.cs
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CollectionExtensions.cs
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/*
* Copyright 2009, Payton Byrd
* Licensed Under the Microsoft Public License (MS-PL)
*/
using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
namespace GenericExtensionMethods
{
// Payton Byrd - 2010/01/19
// All commented code will be removed for version 1.0.0
/// <summary>
/// A collection of extension methods
/// used to perform operations on
/// collections.
/// </summary>
public static class DataSetExtensions
{
/// <summary>
/// Creates a new DataRow and adds it
/// to the source DataTable for the supplied
/// object.
/// </summary>
/// <typeparam name="T">Typed DataRow</typeparam>
/// <param name="source">Object to add to the DataTable.</param>
/// <param name="table">DataTable to add the row to.</param>
/// <returns></returns>
public static T AsDataRow<T>(
this object source,
DataTable table)
where T : DataRow
{
source.AssertParameterNotNull(
"Cannot convert a null source to a DataRow.",
"source");
table.AssertParameterNotNull(
"Cannot add a DataRow to a null DataTable.",
"table");
T result = null;
List<DataColumn> columns =
MakeDataColumns(source);
if (columns.IsNotEmpty())
{
table.AddColumnsToDataTable(columns);
result = (T) table.NewRow();
result.PopulateDataRow(source, columns);
table.Rows.Add(result);
}
return result;
}
/// <summary>
/// Helper method
/// </summary>
/// <param name="row"></param>
/// <param name="source"></param>
/// <param name="columns"></param>
private static void PopulateDataRow(
this DataRow row,
object source,
List<DataColumn> columns)
{
row.AssertParameterNotNull(
"Cannot populate a null DataRow",
"row");
source.AssertParameterNotNull(
"Cannot add values to a DataRow from a null source.",
"source");
columns.AssertParameterNotNull(
"The list of DataColumns is null.",
"columns");
if (columns.IsEmpty())
{
throw new ArgumentOutOfRangeException(
"columns",
"The list of DataColumns is empty.");
}
foreach (DataColumn column in columns)
{
string propertyName = column.Caption;
bool readOnly = column.ReadOnly;
column.ReadOnly = false;
if (propertyName.IsNullOrEmpty())
{
propertyName = column.ColumnName;
}
PropertyInfo property =
source.GetProperty(propertyName,
BindingFlags.Instance |
BindingFlags.Public);
if (property.IsNotNull()
&& property.CanRead)
{
row[column] = property.GetValue(
source, new object[0]);
}
column.ReadOnly = readOnly;
}
}
/// <summary>
/// Adds a list of columns to a DataTable.
/// </summary>
/// <param name="table">The DataTable to add
/// the columns to.</param>
/// <param name="columns">The list of columns
/// to add to the table.</param>
/// <remarks>
/// This method will add unmatched columns,
/// skip redundant columns (same name and type)
/// and add additional columns with a counter
/// for mismatched naming collisions.
/// </remarks>
public static void AddColumnsToDataTable(
this DataTable table,
List<DataColumn> columns)
{
table.AssertParameterNotNull(
"Cannot add columns to a null DataTable.",
"table");
columns.AssertParameterNotNull(
"The list of DataColumns is null.",
"columns");
if (columns.IsEmpty())
{
throw new ArgumentOutOfRangeException(
"columns",
"The list of DataColumns is empty.");
}
List<DataColumn> tableColumns =
table.Columns.ToList();
var replaceList =
new Dictionary<DataColumn, DataColumn>();
foreach (DataColumn column in columns)
{
List<DataColumn> matchingColumns =
(from tableColumn in tableColumns
where tableColumn.ColumnName.StartsWith(column.ColumnName)
&& tableColumn.DataType.Equals(column.DataType)
select tableColumn).ToList();
List<DataColumn> misMatchedColumns =
(from tableColumn in tableColumns
where tableColumn.ColumnName.StartsWith(column.ColumnName)
&& !tableColumn.DataType.Equals(column.DataType)
select tableColumn).ToList();
if (matchingColumns.IsEmpty() &&
misMatchedColumns.IsEmpty())
{
tableColumns.Add(column);
table.Columns.Add(new DataColumn(
column.ColumnName, column.DataType, column.Expression));
}
else if (misMatchedColumns.IsNotEmpty())
{
var newColumn = new DataColumn(
column.ColumnName, column.DataType, column.Expression)
{
Caption = column.ColumnName,
ColumnName = column.ColumnName + misMatchedColumns.Count
};
tableColumns.Add(column);
table.Columns.Add(newColumn);
}
else
{
replaceList.Add(column,
matchingColumns.FirstOrDefault());
}
}
foreach (DataColumn column in replaceList.Keys)
{
columns.Remove(column);
columns.Add(replaceList[column]);
}
}
/// <summary>
/// Helper method.
/// </summary>
/// <param name="source"></param>
/// <returns></returns>
private static List<DataColumn> MakeDataColumns(object source)
{
source.AssertParameterNotNull(
"Cannot make DataColumns from a null source.",
"source");
var result = new List<DataColumn>();
IEnumerable<PropertyInfo> properties =
from propertyInfo in source.GetType().GetProperties(
BindingFlags.Public | BindingFlags.Instance)
where propertyInfo.CanRead
select propertyInfo;
foreach (PropertyInfo property in properties)
{
if (property.CanRead)
{
var column = new DataColumn(
property.Name, property.PropertyType);
column.ReadOnly = !property.CanWrite;
result.Add(column);
}
}
return result;
}
/// <summary>
/// Mades a List<DataColumn> of the
/// DataColumns of the DataColumnCollection.
/// </summary>
/// <param name="source">The list of columns to convert.</param>
/// <returns>Strongly typed list of DataColumn objects.</returns>
/// <example>
/// <code>
/// var table = SomeMethodThatReturnsTable();
///
/// // List<DataColumn>
/// var columnsList = table.Columns.ToList();
/// </code>
/// </example>
public static List<DataColumn> ToList(
this DataColumnCollection source)
{
var tableColumns =
new List<DataColumn>();
foreach (DataColumn tableColumn in source)
{
tableColumns.Add(tableColumn);
}
return tableColumns;
}
}
}