92 lines
3.7 KiB
C#
92 lines
3.7 KiB
C#
// Admin.NET 项目的版权、商标、专利和其他相关权利均受相应法律法规的保护。使用本项目应遵守相关法律法规和许可证的要求。
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//
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// 本项目主要遵循 MIT 许可证和 Apache 许可证（版本 2.0）进行分发和使用。许可证位于源代码树根目录中的 LICENSE-MIT 和 LICENSE-APACHE 文件。
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//
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// 不得利用本项目从事危害国家安全、扰乱社会秩序、侵犯他人合法权益等法律法规禁止的活动！任何基于本项目二次开发而产生的一切法律纠纷和责任，我们不承担任何责任！
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namespace Admin.NET.Core;
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/// <summary>
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/// 通用接口参数验证特性类
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/// </summary>
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[AttributeUsage(AttributeTargets.Property)]
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public class CommonValidationAttribute : ValidationAttribute
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{
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private readonly Dictionary<string, string> _conditions;
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private static readonly Dictionary<string, Delegate> CompiledConditions = new();
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/// <summary>
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/// </summary>
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/// <param name="conditionPairs">条件对参数，长度必须为偶数<br/>
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/// 奇数字符串参数：动态条件<br/>
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/// 偶数字符串参数：提示消息
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/// </param>
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/// <example>
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/// <code lang="C">
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/// public class ModelInput {
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///
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///
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/// public string A { get; set; }
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///
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///
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/// [CommonValidation(
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/// "A == 1 <value>&&</value> B == null", "当 A == 1时，B不能为空",
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/// "C == 2 <value>&&</value> B == null", "当 C == 2时，B不能为空"
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/// )]
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/// public string B { get; set; }
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/// }
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/// </code>
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/// </example>
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public CommonValidationAttribute(params string[] conditionPairs)
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{
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if (conditionPairs.Length % 2 != 0) throw new ArgumentException("条件对必须以偶数个字符串的形式提供。");
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var conditions = new Dictionary<string, string>();
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for (int i = 0; i < conditionPairs.Length; i += 2)
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conditions.Add(conditionPairs[i], conditionPairs[i + 1]);
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_conditions = conditions;
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}
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protected override ValidationResult IsValid(object value, ValidationContext validationContext)
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{
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foreach (var (expr, errorMessage) in _conditions)
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{
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var conditionKey = $"{validationContext.ObjectType.FullName}.{expr}";
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if (!CompiledConditions.TryGetValue(conditionKey, out var condition))
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{
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condition = CreateCondition(validationContext.ObjectType, expr);
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CompiledConditions[conditionKey] = condition;
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}
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if ((bool)condition.DynamicInvoke(validationContext.ObjectInstance)!)
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{
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return new ValidationResult(errorMessage ?? $"[{validationContext.MemberName}]校验失败");
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}
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}
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return ValidationResult.Success;
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}
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private Delegate CreateCondition(Type modelType, string expression)
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{
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try
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{
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// 创建参数表达式
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var parameter = Expression.Parameter(typeof(object), "x");
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// 构建 Lambda 表达式
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var lambda = DynamicExpressionParser.ParseLambda(new[] { Expression.Parameter(modelType, "x") }, typeof(bool), expression);
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// 创建新的 Lambda 表达式，接受 object 参数并调用编译后的表达式
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var invokeExpression = Expression.Invoke(lambda, Expression.Convert(parameter, modelType));
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var finalLambda = Expression.Lambda<Func<object, bool>>(invokeExpression, parameter);
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return finalLambda.Compile();
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}
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catch (Exception ex)
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{
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throw new ArgumentException($"无法解析表达式 '{expression}': {ex.Message}", ex);
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}
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}
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} |