添加项目文件。

Print.Forum.Application.Contracts/ForumApplicationContractsModule.cs

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+using Volo.Abp.Modularity;
+
+namespace Print.Forum.Application.Contracts;
+
+public class ForumApplicationContractsModule : AbpModule
+{
+}

Print.Forum.Application.Contracts/Print.Forum.Application.Contracts.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Volo.Abp.Ddd.Application.Contracts" Version="8.1.1" />
+  </ItemGroup>
+
+</Project>

Print.Forum.Application.Contracts/PrintPictureDto.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Print.Forum.Application.Contracts
+{
+    public class PrintPictureDto
+    {
+        /// <summary>
+        /// 线体编码
+        /// </summary>
+        public string LineCode { get; set; }
+        /// <summary>
+        /// 租户名称
+        /// </summary>
+        public string TenantName { get; set; }
+        public List<string> Base64Data { get; set; }
+        public string ip {  get; set; }
+    }
+}

Print.Forum.Application.Contracts/ResultDto.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Print.Forum.Application.Contracts
+{
+    using System;
+    using System.Collections.Generic;
+    using System.ComponentModel;
+    using System.Text;
+
+    namespace JingGong.Abp.MES
+    {
+        public class CommonDto
+        {
+        }
+
+
+
+        public class SelectOptionDto
+        {
+            /// <summary>
+            /// 选项类型id
+            /// </summary>
+            [Description("选项类型id")]
+            public string Option_Id
+            {
+                get; set;
+            }
+            /// <summary>
+            /// 选项类型名称
+            /// </summary>
+            [Description("选项类型名称")]
+            public string Option_Name { get; set; }
+
+
+            /// <summary>
+            /// 选项扩展
+            /// </summary>
+            [Description("选项扩展")]
+            public string Option_Extend { get; set; }
+
+        }
+        public class ExecResult
+        {
+
+            public string ErrorMessage { get; set; }
+            public bool IsScucess { get; set; }
+            public int ReturnCode { get; set; }
+        }
+
+
+        /// <summary>
+        /// 通用的操作方法返回类（不携带数据）
+        /// </summary>
+        [Serializable]
+        public class ResultDto
+        {
+            /// <summary>
+            /// 操作是否成功
+            /// </summary>
+            [Description("操作是否成功")]
+            public bool IsSuccess { get; set; }
+
+            /// <summary>
+            /// 操作提示语
+            /// </summary>
+            [Description("操作提示语")]
+            public string Info { get; set; }
+
+            /// <summary>
+            /// 错误列表
+            /// </summary>
+            [Description("错误列表")]
+            public List<string> ErrorList { get; set; }
+
+            /// <summary>
+            /// 以是否成功和提示语进行初始化
+            /// </summary>
+            /// <param name="isSuccess">是否成功</param>
+            /// <param name="info">提示语</param>
+            /// <param name="data">辅助对象</param>
+            public ResultDto(bool isSuccess, string info = "")
+            {
+                this.IsSuccess = isSuccess;
+                this.Info = info;
+            }
+            /// <summary>
+            /// 用于if语句，直接判断是否成功
+            /// </summary>
+            /// <param name="t"></param>
+            /// <returns></returns>
+            public static implicit operator Boolean(ResultDto t)
+            {
+                if (t == null)
+                {
+                    return false;
+                }
+                return t.IsSuccess;
+            }
+        }
+
+        /// <summary>
+        /// 通用的操作方法返回类（携带泛型数据）
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        public class ResultDto<T> : ResultDto
+        {
+            /// <summary>
+            /// 携带的辅助对象
+            /// </summary>
+            public T Data { get; set; }
+
+            /// <summary>
+            /// 以操作是否成功、提示语、携带数据进行初始化
+            /// </summary>
+            /// <param name="isSuccess">是否成功</param>
+            /// <param name="info">提示语</param>
+            /// <param name="data">辅助对象</param>
+            public ResultDto(bool isSuccess, string info = "", T data = default(T)) : base(isSuccess, info)
+            {
+                this.Data = data;
+            }
+
+            public ResultDto(ResultDto result) : base(result.IsSuccess, result.Info)
+            {
+                this.Data = default(T);
+            }
+
+            /// <summary>
+            /// 默认构造方法
+            /// </summary>
+            public ResultDto() : base(false, string.Empty)
+            { }
+        }
+    }
+
+}