58 lines
2.6 KiB
C#
58 lines
2.6 KiB
C#
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//---------------------------------------------------------------------
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// <copyright file="Row.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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//
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// @owner [....]
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// @backupOwner [....]
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//---------------------------------------------------------------------
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using System.Collections.Generic;
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using System.Data.Common.CommandTrees;
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using System.Data.Common.Utils;
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namespace System.Data.Common.CommandTrees.ExpressionBuilder
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{
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/// <summary>
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/// The Row class is intended to provide a constructor-like means of calling <see cref="DbExpressionBuilder.NewRow"/>.
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/// </summary>
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public sealed class Row
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{
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private readonly System.Collections.ObjectModel.ReadOnlyCollection<KeyValuePair<string, DbExpression>> arguments;
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/// <summary>
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/// Constructs a new Row with the specified first column value and optional successive column values
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/// </summary>
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/// <param name="columnValue">A key-value pair that provides the first column in the new row instance (required)</param>
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/// <param name="columnValues">Key-value pairs that provide any subsequent columns in the new row instance (optional)</param>
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public Row(KeyValuePair<string, DbExpression> columnValue, params KeyValuePair<string, DbExpression>[] columnValues)
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{
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this.arguments = new System.Collections.ObjectModel.ReadOnlyCollection<KeyValuePair<string, DbExpression>>(Helpers.Prepend(columnValues, columnValue));
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}
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/// <summary>
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/// Creates a new <see cref="DbNewInstanceExpression"/> that constructs a new row based on the columns
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/// contained in this Row instance.
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/// </summary>
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/// <returns>A new DbNewInstanceExpression that constructs a row with the same column names and DbExpression values as this Row instance</returns>
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/// <seealso cref="DbExpressionBuilder.NewRow"/>
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public DbNewInstanceExpression ToExpression()
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{
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return DbExpressionBuilder.NewRow(this.arguments);
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}
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/// <summary>
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/// Converts the given Row instance into an instance of <see cref="DbExpression"/>
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/// </summary>
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/// <param name="row"></param>
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/// <returns>A DbExpression based on the Row instance</returns>
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/// <exception cref="ArgumentNullException"><paramref name="row"/> is null.</exception>
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/// <seealso cref="ToExpression"/>
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public static implicit operator DbExpression(Row row)
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{
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EntityUtil.CheckArgumentNull(row, "row");
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return row.ToExpression();
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}
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}
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}
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