添加项目文件。

FileService.Domain/Entities/UploadFile.cs

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+using FileService.Domain.ValueObjects;
+using IM.DomainCommons;
+
+namespace FileService.Domain.Entities
+{
+    public class UploadFile:AggregateRootEntity
+    {
+        public Guid OwnerId { get; private set; }
+        public FileName FileName { get; private set; }
+        public long FileSize { get;private set; }
+        public ContentType ContentType { get;private set; }
+        public FileState State { get; private set; } = FileState.Uploaded;
+        public StorageLocation StorageLocation { get; private set; } = new StorageLocation();
+        public CheckSum CheckSum { get; private set; }
+
+        private UploadFile() { }
+
+        public UploadFile(Guid ownerId, FileName fileName, long fileSize, ContentType contentType, StorageLocation? storageLocation, CheckSum checkSum)
+        {
+            OwnerId = ownerId;
+            FileName = fileName;
+            FileSize = fileSize;
+            ContentType = contentType;
+            StorageLocation = storageLocation ?? new StorageLocation();
+            CheckSum = checkSum;
+        }
+    }
+}

FileService.Domain/Entities/UploadTask.cs

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+using FileService.Domain.Events;
+using FileService.Domain.ValueObjects;
+using IM.DomainCommons;
+
+namespace FileService.Domain.Entities
+{
+    public class UploadTask:AggregateRootEntity
+    {
+        public Guid UploaderId { get; private set; }
+        public Guid ConversationId { get; private set; }
+        public FileName FileName { get; private set; }
+        public long FileSize { get; private set; }
+        public ContentType ContentType { get; private set; }
+        public StorageLocation StorageLocation { get; private set; }
+        public UploadTaskState State { get; private set; }
+        public CheckSum CheckSum { get; private set; }
+
+        private UploadTask() { }
+
+        public UploadTask(Guid uploaderId, Guid conversationId, FileName fileName, long fileSize, ContentType contentType, StorageLocation? storageLocation, CheckSum checkSum)
+        {
+            UploaderId = uploaderId;
+            ConversationId = conversationId;
+            FileName = fileName;
+            FileSize = fileSize;
+            ContentType = contentType;
+            StorageLocation = storageLocation ?? new StorageLocation();
+            CheckSum = checkSum;
+        }
+
+        public void StartUpload()
+        {
+            State = UploadTaskState.Uploading;
+        }
+
+        public void CompleteUpload(StorageLocation location)
+        {
+            State = UploadTaskState.Completed;
+            AddDomainEvent(new UploadTaskCompletedDomainEvent(this));
+        }
+
+        public void Fail()
+        {
+            State = UploadTaskState.Failed;
+
+        }
+    }
+}

FileService.Domain/Events/UploadTaskCompletedDomainEvent.cs

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+using FileService.Domain.Entities;
+using MediatR;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FileService.Domain.Events
+{
+    public class UploadTaskCompletedDomainEvent(UploadTask task):INotification;
+}

FileService.Domain/FileService.Domain.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\DomainCommons\IM.DomainCommons.csproj" />
+  </ItemGroup>
+
+</Project>

FileService.Domain/FileState.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FileService.Domain
+{
+    public enum FileState
+    {
+        Created = 0,
+        Uploading = 1,
+        Uploaded = 2,
+        Failed = 3,
+        Deleted = 4
+    }
+}

FileService.Domain/IReposities/IUploadFileReposity.cs

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+using FileService.Domain.Entities;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FileService.Domain.IReposities
+{
+    public interface IUploadFileReposity
+    {
+        void Create(UploadFile file);
+        Task<UploadFile?> FindByIdAsync(Guid id); 
+        Task<UploadFile?> FindByCheckSumAsync(Guid uploaderId,string value);
+    }
+}

FileService.Domain/IReposities/IUploadTaskReposity.cs

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+using FileService.Domain.Entities;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FileService.Domain.IReposities
+{
+    public interface IUploadTaskReposity
+    {
+        void Create(UploadTask task);
+        Task<UploadTask?> FindByIdAsync(Guid id);
+        Task<UploadTask?> FindByCheckSumAsync(string value);
+    }
+}

FileService.Domain/UploadTaskState.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FileService.Domain
+{
+    public enum UploadTaskState
+    {
+        Created = 0,
+        Failed = 1,
+        Uploading = 2,
+        Uploaded = 4,
+        Merging = 5,
+        Completed = 6,
+    }
+}

FileService.Domain/ValueObjects/CheckSum.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FileService.Domain.ValueObjects
+{
+    public class CheckSum
+    {
+        public string Algorithm { get; }
+        public string Value { get; }
+
+        public CheckSum(string algorithm, string value)
+        {
+            Algorithm = algorithm;
+            Value = value;
+        }
+
+        public override string ToString()
+        {
+            return Value;
+        }
+
+        public static implicit operator CheckSum((string algorithm, string value) value)
+        {
+            return new CheckSum(value.algorithm, value.value);
+        }
+    }
+}

FileService.Domain/ValueObjects/ContentType.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FileService.Domain.ValueObjects
+{
+    public class ContentType
+    {
+        public string Value { get; }
+        public ContentType(string contentType)
+        {
+            Value = contentType;
+        }
+
+        public override string ToString()
+        {
+            return Value;
+        }
+
+        public static implicit operator ContentType(string contentType)
+        {
+            return new ContentType(contentType);
+        }
+    }
+}

FileService.Domain/ValueObjects/FileName.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FileService.Domain.ValueObjects
+{
+    public class FileName
+    {
+        public string Value { get; }
+
+        public FileName(string value)
+        {
+            if(value.Length > 20)
+            {
+                throw new ArgumentException("文件名超出长度");
+            }
+
+            Value = value;
+        }
+
+        public override string ToString()
+        {
+            return Value;
+        }
+
+        public static implicit operator FileName(string value)
+        {
+            return new FileName(value);
+        }
+
+    }
+}

FileService.Domain/ValueObjects/StorageLocation.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FileService.Domain.ValueObjects
+{
+    public class StorageLocation
+    {
+        public string StorageProvider { get; private set; } = "Local";
+        public string Bucket { get; private set; } = string.Empty;
+        public string ObjectKey { get; private set; } = string.Empty;
+        public string? Region { get; private set; } = string.Empty;
+
+        public StorageLocation()
+        {
+
+        }
+
+        public StorageLocation(string storageProvider, string bucket, string objectKey, string? region = null)
+        {
+            this.StorageProvider = storageProvider;
+            this.Bucket = bucket;
+            this.ObjectKey = objectKey;
+            this.Region = region;
+        }
+    }
+}