我正在尝试将hashset<string>保存到数据库中然后检索它，但是我不知道如何为此使用二进制读取器。
#region Types中的位置
TypeList = new Dictionary<string, Type>
我有：
[typeof(HashSet<string>).FullName]=typeof(HashSet<string>)
要写，我有：
[typeof(HashSet<string>)] = (v,w) =>
{
w.Write(v != null);
if (v == null) return;
HashSet<string> datas = (HashSet<string>)v;
w.Write(datas.Count);
foreach(string data in datas)
{
w.Write(data);
}
}
但是我不知道如何将其从数据库读回哈希集
[typeof(HashSet<string>)] = r=>
{
int length = r.ReadInt32();
HashSet<string> data = new HashSet<string>();
for (int i = 0; i < length; i++)
data.Add(r.ReadString());
return data;
}
此操作失败并显示错误：
无法读取到流的末尾。
我对二进制阅读器的了解非常低，我不确定如何从数据库中读取哈希集。显然，该循环不会完全正确，因为哈希集中没有length()，没有对值进行索引等，其优点（以及为什么我需要在代码的其他地方使用它）是，它永远不能包含两个相同的值。
r.count不起作用（即使那是您如何找到哈希集的“长度”，我也不知道如何对r内的值进行迭代（即使那是您的方式），这驱使我现在在墙上呆了两天。
澄清：我正在添加一个开放源代码游戏，用户数据存储在数据库中，我的哈希集数组未保存时出现问题，似乎处理数据库的类需要定义的每种类型，对我来说很陌生的区域之前从未真正处理过数据存储。我向我保证，一旦添加了定义以告诉它如何处理哈希集，那么哈希集将保存...。但是我不知道该怎么做，我正在尝试并且已经存在了一段时间（并且仍然是）。具有讽刺意味的是，这是我正在努力保持精神和心理健康同时被屏蔽的工作，后者肯定正在遭受痛苦
全班：
using System; using System.Collections; using System.Collections.Generic; using System.Drawing; using System.IO; using System.Reflection; using System.Text; using System.Threading.Tasks; using Library; namespace MirDB { public sealed class DBValue { internal static readonly Dictionary<string, Type> TypeList; private static readonly Dictionary<Type, Func<BinaryReader, object>> TypeRead; private static readonly Dictionary<Type, Action<object, BinaryWriter>> TypeWrite; static DBValue() { #region Types TypeList = new Dictionary<string, Type> { [typeof(Boolean).FullName] = typeof(Boolean), [typeof(Byte).FullName] = typeof(Byte), [typeof(Byte[]).FullName] = typeof(Byte[]), [typeof(Char).FullName] = typeof(Char), [typeof(Color).FullName] = typeof(Color), [typeof(DateTime).FullName] = typeof(DateTime), [typeof(Decimal).FullName] = typeof(Decimal), [typeof(Double).FullName] = typeof(Double), [typeof(Int16).FullName] = typeof(Int16), [typeof(Int32).FullName] = typeof(Int32), [typeof(Int32[]).FullName] = typeof(Int32[]), [typeof(Int64).FullName] = typeof(Int64), [typeof(Point).FullName] = typeof(Point), [typeof(SByte).FullName] = typeof(SByte), [typeof(Single).FullName] = typeof(Single), [typeof(Size).FullName] = typeof(Size), [typeof(String).FullName] = typeof(String), [typeof(TimeSpan).FullName] = typeof(TimeSpan), [typeof(UInt16).FullName] = typeof(UInt16), [typeof(UInt32).FullName] = typeof(UInt32), [typeof(UInt64).FullName] = typeof(UInt64), [typeof(Point[]).FullName] = typeof(Point[]), [typeof(Stats).FullName] = typeof(Stats), [typeof(BitArray).FullName] = typeof(BitArray), [typeof(HashSet<string>).FullName]=typeof(HashSet<string>) }; #endregion #region Reads TypeRead = new Dictionary<Type, Func<BinaryReader, object>> { [typeof(Boolean)] = r => r.ReadBoolean(), [typeof(Byte)] = r => r.ReadByte(), [typeof(Byte[])] = r => r.ReadBytes(r.ReadInt32()), [typeof(Char)] = r => r.ReadChar(), [typeof(Color)] = r => Color.FromArgb(r.ReadInt32()), [typeof(DateTime)] = r => DateTime.FromBinary(r.ReadInt64()), [typeof(Decimal)] = r => r.ReadDecimal(), [typeof(Double)] = r => r.ReadDouble(), [typeof(Enum)] = r => r.ReadInt32(), [typeof(Int16)] = r => r.ReadInt16(), [typeof(Int32)] = r => r.ReadInt32(), [typeof(Int32[])] = r => { if (!r.ReadBoolean()) return null; int length = r.ReadInt32(); Int32[] values = new Int32[length]; for (int i = 0; i < length; i++) values[i] = r.ReadInt32(); return values; }, [typeof(Int64)] = r => r.ReadInt64(), [typeof(Point)] = r => new Point(r.ReadInt32(), r.ReadInt32()), [typeof(SByte)] = r => r.ReadSByte(), [typeof(Single)] = r => r.ReadSingle(), [typeof(Size)] = r => new Size(r.ReadInt32(), r.ReadInt32()), [typeof(String)] = r => r.ReadString(), [typeof(TimeSpan)] = r => TimeSpan.FromTicks(r.ReadInt64()), [typeof(UInt16)] = r => r.ReadUInt16(), [typeof(UInt32)] = r => r.ReadUInt32(), [typeof(UInt64)] = r => r.ReadUInt64(), [typeof(Point[])] = r => { if (!r.ReadBoolean()) return null; int length = r.ReadInt32(); Point[] points = new Point[length]; for (int i = 0; i < length; i++) points[i] = new Point(r.ReadInt32(), r.ReadInt32()); return points; }, [typeof(Stats)] = r => r.ReadBoolean() ? new Stats(r) : null, [typeof(BitArray)] = r => { if (!r.ReadBoolean()) return null; return new BitArray(r.ReadBytes(r.ReadInt32())); }, [typeof(HashSet<string>)] = r=> { int length =r.ReadInt32(); string[] temp = new string[length]; for (int i = 0; i < length; i++) { temp[i] = r.ReadString(); } HashSet<string> data = new HashSet<string>(); foreach(string indata in temp) { data.Add(indata); } return data; } }; #endregion #region Writes TypeWrite = new Dictionary<Type, Action<object, BinaryWriter>> { [typeof(Boolean)] = (v, w) => w.Write((bool) v), [typeof(Byte)] = (v, w) => w.Write((Byte) v), [typeof(Byte[])] = (v, w) => { w.Write(((Byte[]) v).Length); w.Write((Byte[]) v); }, [typeof(Char)] = (v, w) => w.Write((Char) v), [typeof(Color)] = (v, w) => w.Write(((Color) v).ToArgb()), [typeof(DateTime)] = (v, w) => w.Write(((DateTime) v).ToBinary()), [typeof(Decimal)] = (v, w) => w.Write((Decimal) v), [typeof(Double)] = (v, w) => w.Write((Double) v), [typeof(Int16)] = (v, w) => w.Write((Int16) v), [typeof(Int32)] = (v, w) => w.Write((Int32) v), [typeof(Int32[])] = (v, w) => { w.Write(v != null); if (v == null) return; Int32[] values = (Int32[]) v; w.Write(values.Length); foreach (Int32 value in values) w.Write(value); }, [typeof(Int64)] = (v, w) => w.Write((Int64) v), [typeof(Point)] = (v, w) => { w.Write(((Point) v).X); w.Write(((Point) v).Y); }, [typeof(SByte)] = (v, w) => w.Write((SByte) v), [typeof(Single)] = (v, w) => w.Write((Single) v), [typeof(Size)] = (v, w) => { w.Write(((Size) v).Width); w.Write(((Size) v).Height); }, [typeof(String)] = (v, w) => w.Write((String) v ?? string.Empty), [typeof(TimeSpan)] = (v, w) => w.Write(((TimeSpan) v).Ticks), [typeof(UInt16)] = (v, w) => w.Write((UInt16) v), [typeof(UInt32)] = (v, w) => w.Write((UInt32) v), [typeof(UInt64)] = (v, w) => w.Write((UInt64) v), [typeof(Point[])] = (v, w) => { w.Write(v != null); if (v == null) return; Point[] points = (Point[]) v; w.Write(points.Length); foreach (Point point in points) { w.Write(point.X); w.Write(point.Y); } }, [typeof(Stats)] = (v, w) => { w.Write(v != null); if (v == null) return; ((Stats)v).Write(w); }, [typeof(BitArray)] = (v, w) => { w.Write(v != null); if (v == null) return; BitArray array = (BitArray) v; byte[] bytes = new byte[(int) Math.Ceiling(array.Length/8d)]; array.CopyTo(bytes, 0); w.Write(bytes.Length); w.Write(bytes); }, [typeof(HashSet<string>)] = (v,w) => { w.Write(v != null); if (v == null) return; HashSet<string> datas = (HashSet<string>)v; w.Write(datas.Count); foreach(string data in datas) { w.Write(data); } } }; #endregion } public string PropertyName { get; } public Type PropertyType { get; } public PropertyInfo Property { get; } public DBValue(BinaryReader reader, Type type) { PropertyName = reader.ReadString(); PropertyType = TypeList[reader.ReadString()]; PropertyInfo property = type?.GetProperty(PropertyName); if (property != null) if (property.GetCustomAttribute<IgnoreProperty>() != null) return; Property = property; } public DBValue(PropertyInfo property) { Property = property; PropertyName = property.Name; if (property.PropertyType.IsEnum) { PropertyType = property.PropertyType.GetEnumUnderlyingType(); return; } if (property.PropertyType.IsSubclassOf(typeof(DBObject))) { PropertyType = typeof(int); return; } PropertyType = property.PropertyType; } public void Save(BinaryWriter writer) { writer.Write(PropertyName); writer.Write(PropertyType.FullName); } public object ReadValue(BinaryReader reader) { return TypeRead[PropertyType](reader); } public void WriteValue(object value, BinaryWriter writer) { TypeWrite[PropertyType](value, writer); } public bool IsMatch(DBValue value) { return string.Compare(PropertyName, value.PropertyName, StringComparison.Ordinal) == 0 && PropertyType == value.PropertyType; } }}
我正在尝试将哈希集
似乎我一开始不是在阅读布尔值。...这条线使我绕弯转了两天.....简直看不到它丢失了。