38 lines
1.4 KiB
C#
38 lines
1.4 KiB
C#
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using System;
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namespace Plane
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{
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public static class StringExtensions
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{
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/// <summary>
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/// 把字符串转换成其表示的日期。
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/// </summary>
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/// <param name="value">形如 yyyyMMdd 或 yyyyMMddHHmmss 的字符串。</param>
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/// <returns>指定的字符串表示的日期。</returns>
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public static DateTime ToDateTime(this string value)
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{
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if (value == null) throw new ArgumentNullException(nameof(value));
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if (value.Length == 8)
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{
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return new DateTime(
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Convert.ToInt32(value.Substring(0, 4)),
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Convert.ToInt32(value.Substring(4, 2)),
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Convert.ToInt32(value.Substring(6, 2))
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);
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}
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else if (value.Length == 14)
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{
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return new DateTime(
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Convert.ToInt32(value.Substring(0, 4)),
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Convert.ToInt32(value.Substring(4, 2)),
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Convert.ToInt32(value.Substring(6, 2)),
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Convert.ToInt32(value.Substring(8, 2)),
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Convert.ToInt32(value.Substring(10, 2)),
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Convert.ToInt32(value.Substring(12, 2))
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);
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}
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throw new InvalidOperationException("String.ToDateTime 扩展方法只支持 yyyyMMdd 和 yyyyMMddHHmmss 两种形式的字符串！");
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}
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}
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}
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