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api_v1/Appointment.Entity/ValidateAttribute/StringMaxLengthAttribute.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Appointment.Entity.ValidateAttribute
+{
+    /// <summary>
+    /// 字符串最大长度
+    /// </summary>
+    /// <remarks>
+    /// Add:yuangb 2020-12-9
+    /// 使用格式：实体属性前加 [StringMaxLength(200, ErrorMessage = "备注说明最大长度200个字符")]
+    /// </remarks>
+    public class StringMaxLengthAttribute : ValidateAttribute
+    {
+        private int _MaxLength = 0;
+
+        /// <summary>
+        /// 报错提示
+        /// </summary>
+        public string ErrorMessage { get; set; }
+
+        public StringMaxLengthAttribute(int maxLength)
+        {
+            _MaxLength = maxLength;
+        }
+
+        public override string Validate(object oValue)
+        {
+            if (oValue != null && oValue.ToString().Length > _MaxLength)
+            {
+                return ErrorMessage;
+            }
+            return null;
+        }
+    }
+}