添加项目文件。

Sai.Toolkit.Mvvm/Attributes/GreaterThanAttribute.cs

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+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace Sai.Toolkit.Mvvm.Attributes;
+
+[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter)]
+public sealed class GreaterThanAttribute : ValidationAttribute
+{
+	public GreaterThanAttribute(string propertyName)
+	{
+		PropertyName = propertyName;
+	}
+
+	public string PropertyName { get; }
+
+	protected override ValidationResult IsValid(object value, ValidationContext validationContext)
+	{
+		object instance = validationContext.ObjectInstance,
+			otherValue = instance.GetType().GetProperty(PropertyName).GetValue(instance);
+
+		return ((IComparable)value).CompareTo(otherValue) > 0 ? ValidationResult.Success : new($"当前值小于{value}");
+	}
+}

Sai.Toolkit.Mvvm/Attributes/IsNumericAttribute.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace Sai.Toolkit.Mvvm.Attributes;
+
+[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter)]
+public sealed class IsNumericAttribute : ValidationAttribute
+{
+    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
+    {
+        return double.TryParse(value.ToString(), out var _) ? ValidationResult.Success : new("输入内容不是数值。");
+    }
+}

Sai.Toolkit.Mvvm/Attributes/MaximumAttribute.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace Sai.Toolkit.Mvvm.Attributes;
+
+[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter)]
+public sealed class MaximumAttribute : ValidationAttribute
+{
+	public MaximumAttribute(double maxValue = 0)
+	{
+		MaxValue = maxValue;
+	}
+
+	public double MaxValue { get; }
+
+	protected override ValidationResult IsValid(object value, ValidationContext validationContext)
+	{
+		return double.TryParse(value.ToString(), out var d) && d <= MaxValue ? ValidationResult.Success : new ValidationResult("输入值超出范围");
+	}
+}

Sai.Toolkit.Mvvm/Attributes/MinimumAttribute.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace Sai.Toolkit.Mvvm.Attributes;
+
+[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter)]
+public sealed class MinimumAttribute : ValidationAttribute
+{
+    public MinimumAttribute(double minValue = 0)
+    {
+        MinValue = minValue;
+    }
+
+    public double MinValue { get; }
+
+    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
+    {
+        return double.TryParse(value.ToString(), out var d) && d >= MinValue ? ValidationResult.Success : new ValidationResult("ÊäÈëÖµ³¬³ö·¶Î§");
+    }
+}

Sai.Toolkit.Mvvm/Attributes/NotNullOrEmptyAttribute.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace Sai.Toolkit.Mvvm.Attributes;
+
+[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter)]
+public sealed class NotNullOrEmptyAttribute : ValidationAttribute
+{
+    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
+    {
+        var b = value != null || (value is string str && !string.IsNullOrEmpty(str));
+        return b ? ValidationResult.Success : new("输入内容不是数值。");
+    }
+}

Sai.Toolkit.Mvvm/Attributes/UndefinedCharAttribute.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Text;
+
+namespace Sai.Toolkit.Mvvm.Attributes
+{
+    [AttributeUsage(AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter)]
+    public class UndefinedCharAttribute : ValidationAttribute
+    {
+        public UndefinedCharAttribute(params char[] chars)
+        {
+            Chars = chars;
+        }
+
+        public char[] Chars { get; }
+
+        protected override ValidationResult IsValid(object value, ValidationContext validationContext)
+        {
+            //char[] chars = new[] { '\\', ':', '{', '}', '[', ']', '|', ';', '<', '>', '?', '`', '~' };
+            if (value != null)
+            {
+                foreach (var c in Chars)
+                {
+                    if (value.ToString().IndexOf(c) > -1)
+                    {
+                        return new ValidationResult($"输入字符不合法,名称不能包含字符:'\\ : [ ] | {{}}; < > ? ` ~");
+                    }
+                }
+            }
+            return ValidationResult.Success;
+        }
+    }
+}