From 473d10533a76e136344f4366d275fb5424bd0bd4 Mon Sep 17 00:00:00 2001
From: hang <872297557@qq.com>
Date: Mon, 19 Jan 2026 14:25:59 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BF=AE=E6=94=B9=E7=BB=91=E5=AE=9A=E6=A8=A1?=
 =?UTF-8?q?=E5=9E=8B=E9=80=BB=E8=BE=91?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 IRaCIS.Core.API/Progranm.cs                   |  2 +-
 .../LegacyController/ModelActionFilter .cs    | 61 ++++++++++++++-----
 2 files changed, 48 insertions(+), 15 deletions(-)

diff --git a/IRaCIS.Core.API/Progranm.cs b/IRaCIS.Core.API/Progranm.cs
index c80a2171a..394625ba5 100644
--- a/IRaCIS.Core.API/Progranm.cs
+++ b/IRaCIS.Core.API/Progranm.cs
@@ -97,7 +97,7 @@ builder.Services.AddJsonLocalization(options => options.ResourcesPath = "Resourc
 builder.Services.AddControllers(options =>
 {
     // 插到最前，抢在默认绑定器之前
-    options.ModelBinderProviders.Insert(0, new NullableStructModelBinderProvider());
+    //options.ModelBinderProviders.Insert(0, new NullableStructModelBinderProvider());
 
     options.Filters.Add<ModelActionFilter>();
     options.Filters.Add<ProjectExceptionFilter>();
diff --git a/IRaCIS.Core.Application/BusinessFilter/LegacyController/ModelActionFilter .cs b/IRaCIS.Core.Application/BusinessFilter/LegacyController/ModelActionFilter .cs
index abe4800de..8095e55b8 100644
--- a/IRaCIS.Core.Application/BusinessFilter/LegacyController/ModelActionFilter .cs	
+++ b/IRaCIS.Core.Application/BusinessFilter/LegacyController/ModelActionFilter .cs	
@@ -38,30 +38,38 @@ public class NullableStructModelBinderProvider : IModelBinderProvider
         // 获取要绑定的模型类型，比如 Guid?, int?, DateTime? 等
         var type = context.Metadata.ModelType;
 
+        //创建默认的模型绑定器（系统的原逻辑）
+        var fallback = context.CreateBinder(context.Metadata);
+
+
+        // 1. 处理 string 类型
+        if (type == typeof(string))
+        {
+            return new StringNotNullableModelBinder(fallback);
+        }
+
         // 检查是否是 Nullable<T> 类型
         // 1. 必须是泛型类型
         // 2. 泛型定义必须是 Nullable<>
-        if (!type.IsGenericType ||
-            type.GetGenericTypeDefinition() != typeof(Nullable<>))
-            return null; // 返回 null 表示"我不处理这个类型"
+        if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>))
+        {
+            // 获取可空类型内部的实际类型，如 Guid?, int? 中的 Guid, int
+            var innerType = Nullable.GetUnderlyingType(type)!;
 
 
-        // 获取可空类型内部的实际类型，如 Guid?, int? 中的 Guid, int
-        var innerType = Nullable.GetUnderlyingType(type)!;
+            var binderType = typeof(NullableEmptyStringToNullBinder<>).MakeGenericType(innerType);
 
-        // 创建默认的模型绑定器（系统的原逻辑）
-        var fallback = context.CreateBinder(context.Metadata);
+            // 实例化绑定器，传入默认绑定器作为备用
+            return (IModelBinder)Activator.CreateInstance(binderType, fallback)!;
+        }
 
-        // 创建泛型绑定器类型：NullableEmptyStringToNullBinder<T>
-        // 比如对于 Guid?，会创建 NullableEmptyStringToNullBinder<Guid>
-        var binderType = typeof(NullableEmptyStringToNullBinder<>).MakeGenericType(innerType);
 
-        // 实例化绑定器，传入默认绑定器作为备用
-        return (IModelBinder)Activator.CreateInstance(binderType, fallback)!;
+        return null; // 返回 null 表示"我不处理这个类型"
+
     }
 }
 
-// 泛型约束：T 必须是值类型（struct），这确保了只处理可空值类型
+// 泛型约束：T 必须是值类型（struct），这确保了只处理可空值类型   比如处理guid? 传递"" 为null
 public class NullableEmptyStringToNullBinder<T> : IModelBinder where T : struct
 {
     private readonly IModelBinder _fallbackBinder;
@@ -91,4 +99,29 @@ public class NullableEmptyStringToNullBinder<T> : IModelBinder where T : struct
         // 比如将 "123" 转换为 int? 123，或将 GUID 字符串转换为 Guid?
         await _fallbackBinder.BindModelAsync(context);
     }
-}
\ No newline at end of file
+}
+
+// 处理 string 的绑定器  如果前端不传递  或者null 时 处理为 ""
+public class StringNotNullableModelBinder : IModelBinder
+{
+    private readonly IModelBinder _fallbackBinder;
+
+    public StringNotNullableModelBinder(IModelBinder fallbackBinder)
+    {
+        _fallbackBinder = fallbackBinder;
+    }
+
+    public async Task BindModelAsync(ModelBindingContext context)
+    {
+        var value = context.ValueProvider.GetValue(context.ModelName).FirstValue;
+
+        // 前端不传或传空字符串，都设为 string.Empty
+        if (string.IsNullOrWhiteSpace(value))
+        {
+            context.Result = ModelBindingResult.Success(string.Empty);
+            return;
+        }
+
+        await _fallbackBinder.BindModelAsync(context);
+    }
+}