63 lines
1.6 KiB
C#
63 lines
1.6 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="Range.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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// <owner current="true" primary="true">[....]</owner>
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// <owner current="true" primary="false">[....]</owner>
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// <owner current="false" primary="false">[....]</owner>
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//------------------------------------------------------------------------------
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namespace System.Data {
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using System;
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internal struct Range {
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private int min;
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private int max;
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private bool isNotNull; // zero bit pattern represents null
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public Range(int min, int max) {
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if (min > max) {
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throw ExceptionBuilder.RangeArgument(min, max);
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}
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this.min = min;
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this.max = max;
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isNotNull = true;
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}
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public int Count {
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get {
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if (IsNull)
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return 0;
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return max - min + 1;
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}
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}
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public bool IsNull {
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get {
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return !isNotNull;
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}
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}
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public int Max {
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get {
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CheckNull();
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return max;
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}
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}
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public int Min {
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get {
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CheckNull();
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return min;
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}
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}
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internal void CheckNull() {
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if (this.IsNull) {
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throw ExceptionBuilder.NullRange();
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}
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}
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}
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}
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