128 lines
4.6 KiB
C#
128 lines
4.6 KiB
C#
using System.Data;
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using System.Globalization;
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using DMS.Application.DTOs;
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using DMS.Application.Interfaces;
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using DMS.Application.Models;
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using DMS.Core.Enums;
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using DMS.Core.Models;
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using Microsoft.Extensions.Logging;
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namespace DMS.Application.Services.Processors;
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public class ValueConvertProcessor : IVariableProcessor
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{
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private readonly ILogger<ValueConvertProcessor> _logger;
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public ValueConvertProcessor(ILogger<ValueConvertProcessor> logger)
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{
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_logger = logger;
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}
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public Task ProcessAsync(VariableContext context)
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{
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var oldValue = context.Data.DataValue;
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// 如果值没有变化则中断处理链
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if (context.Data.DataValue == context.NewValue)
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{
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context.IsHandled = true;
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}
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// 步骤 1: 将原始值转换为 DataValue 和 NumericValue
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context.Data.DataValue = context.NewValue;
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if (context.Data.DataType == DataType.Bool)
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{
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context.Data.NumericValue=context.NewValue=="True"?1:0;
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context.Data.DisplayValue = context.NewValue;
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}
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else
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{
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if (double.TryParse(context.Data.DataValue, NumberStyles.Float, CultureInfo.InvariantCulture, out var parsedFromStr))
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{
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context.Data.NumericValue = parsedFromStr;
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}
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// 步骤 2: 根据公式计算 DisplayValue
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CalculateDisplayValue(context.Data);
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}
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context.Data.UpdatedAt = DateTime.Now;
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return Task.CompletedTask;
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}
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/// <summary>
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/// 根据转换公式计算用于UI显示的DisplayValue
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/// </summary>
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/// <param name="variable">需要处理的变量DTO</param>
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private void CalculateDisplayValue(Variable variable)
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{
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// 默认情况下，显示值等于原始数据值
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variable.DisplayValue = variable.DataValue;
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// 如果没有转换公式，则直接返回
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if (string.IsNullOrWhiteSpace(variable.ConversionFormula))
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{
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return;
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}
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try
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{
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// 将公式中的 'x' 替换为实际的数值
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// 使用 InvariantCulture 确保小数点是 '.'
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string expression = variable.ConversionFormula.ToLowerInvariant()
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.Replace("x", variable.NumericValue.ToString(CultureInfo.InvariantCulture));
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// 使用 DataTable.Compute 来安全地计算表达式
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var result = new DataTable().Compute(expression, null);
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// 将计算结果格式化后赋给 DisplayValue
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if (result is double || result is decimal || result is float)
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{
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variable.DisplayValue = string.Format("{0:F2}", result); // 默认格式化为两位小数，可根据需要调整
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variable.NumericValue = Convert.ToDouble(result); // 更新NumericValue为计算后的值
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}
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else
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{
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variable.DisplayValue = result.ToString();
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// 尝试将字符串结果解析回double，以更新NumericValue
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if (double.TryParse(result.ToString(), NumberStyles.Any, CultureInfo.InvariantCulture, out var parsedResult))
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{
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variable.NumericValue = parsedResult;
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}
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} }
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catch (Exception ex)
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{
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_logger.LogError(ex, $"为变量 {variable.Name} (ID: {variable.Id}) 计算DisplayValue时出错。公式: '{variable.ConversionFormula}'");
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// 如果计算出错，DisplayValue 将保持为原始的 DataValue，保证程序健壮性
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}
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}
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/// <summary>
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/// 将从 S7 读取的对象值转换为字符串表示和数值表示
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/// </summary>
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/// <param name="variable">关联的变量 DTO</param>
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/// <param name="value">从 S7 读取的原始对象值</param>
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private void ConvertS7ValueToStringAndNumeric(Variable variable, string value)
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{
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if (value == null)
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return;
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string directConversion = null;
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double numericValue = 0.0;
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if (variable.DataType == DataType.Bool)
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{
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numericValue=value.ToString()=="True"?1.0:0.0;
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directConversion = value.ToString();
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return;
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}
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variable.DataValue = directConversion ?? value.ToString() ?? string.Empty;
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variable.NumericValue = numericValue;
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}
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} |