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67 lines
2.2 KiB
C#
67 lines
2.2 KiB
C#
#region copyright
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//------------------------------------------------------------------------------
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// 此代码版权声明为全文件覆盖，如有原作者特别声明，会在下方手动补充
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// 此代码版权（除特别声明外的代码）归作者本人Diego所有
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// 源代码使用协议遵循本仓库的开源协议及附加协议
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// Gitee源代码仓库：https://gitee.com/diego2098/ThingsGateway
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// Github源代码仓库：https://github.com/kimdiego2098/ThingsGateway
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// 使用文档：https://diego2098.gitee.io/thingsgateway-docs/
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// QQ群：605534569
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//------------------------------------------------------------------------------
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#endregion
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using CodingSeb.ExpressionEvaluator;
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using Microsoft.Extensions.DependencyInjection;
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namespace ThingsGateway.Application.Extensions;
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/// <summary>
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/// 表达式扩展
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/// </summary>
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[System.Security.SecuritySafeCritical]
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public static class ExpressionEvaluatorExtensions
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{
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private static readonly GlobalDeviceData GlobalDeviceData;
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static ExpressionEvaluatorExtensions()
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{
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GlobalDeviceData = ServiceHelper.Services.GetService<GlobalDeviceData>();
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}
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/// <summary>
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/// 计算表达式：例如：raw*100，raw为原始值
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/// </summary>
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public static object GetExpressionsResult(this string expressions, ExpressionEvaluator expressionEvaluator, object rawvalue)
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{
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if (expressions.IsNullOrEmpty())
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{
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return rawvalue;
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}
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expressionEvaluator.Variables = new Dictionary<string, object>()
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{
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{ "Raw", rawvalue},
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{ "raw", rawvalue},
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};
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var value = expressionEvaluator.Evaluate(expressions);
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return value;
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}
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/// <summary>
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/// 表达式的扩展变量来源
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/// </summary>
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/// <param name="sender"></param>
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/// <param name="e"></param>
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public static void Evaluator_PreEvaluateVariable(object sender, VariablePreEvaluationEventArg e)
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{
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var obj = GlobalDeviceData.AllVariables.FirstOrDefault(it => it.Name == e.Name);
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if (obj == null)
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{
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return;
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}
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if (obj.Value != null)
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e.Value = Convert.ChangeType(obj.Value, obj.DataType);
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}
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}
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