50 lines
1.6 KiB
C#
50 lines
1.6 KiB
C#
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using System;
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using System.IO;
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using System.Text;
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namespace PCL.Core.Utils;
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public class StringStream : Stream
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{
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private readonly MemoryStream _innerStream;
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/// <summary>
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/// 使用指定编码初始化 StringStream。
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/// </summary>
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public StringStream(string source, Encoding? encoding = null)
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{
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ArgumentNullException.ThrowIfNull(source);
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encoding ??= Encoding.UTF8;
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var buffer = encoding.GetBytes(source);
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_innerStream = new MemoryStream(buffer);
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}
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public override bool CanRead => _innerStream.CanRead;
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public override bool CanSeek => _innerStream.CanSeek;
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public override bool CanWrite => false;
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public override long Length => _innerStream.Length;
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public override long Position
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{
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get => _innerStream.Position;
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set => _innerStream.Position = value;
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}
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public override void Flush() { /* 只读流 无需实现 */ }
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public override int Read(byte[] buffer, int offset, int count) => _innerStream.Read(buffer, offset, count);
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public override long Seek(long offset, SeekOrigin origin) => _innerStream.Seek(offset, origin);
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public override void SetLength(long value) => throw new NotSupportedException("StringStream 是只读流，不支持 SetLength。");
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public override void Write(byte[] buffer, int offset, int count) => throw new NotSupportedException("StringStream 是只读流，不支持 Write。");
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protected override void Dispose(bool disposing)
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{
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if (disposing) _innerStream.Dispose();
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base.Dispose(disposing);
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}
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}
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