dynamicexpress's Introduction

DynamicExpress/动态表达式计算

作用

根据动态算法以及给定的对象计算并返回计算结果
用法

1.单个对象（single entity）

T MathDynamicExpress.Core.DynamicExpress.Eval<T>(string expression, object entity)
例如(ex)：
MathDynamicExpress.Core.DynamicExpress.Eval<double>("({Field1}+{Field2})*{Field3}", new
         {
             Field1=txt_entity1_field1.Text,
             Field2 = txt_entity1_field2.Text,
             Field3 = txt_entity1_field3.Text
         });

2.多个对象(entities)

T MathDynamicExpress.Core.DynamicExpress.Eval<T>(string expression,params object[] entity)
例如(ex):
MathDynamicExpress.Core.DynamicExpress.Eval<double>("({0.Field1}-{1.Field1})+{1.Field2}*{0.Field2}", 
             new
             {
                 Field1=txt_entity1_field1.Text,
                 Field2 = txt_entity1_field2.Text
             }, 
             new
             {
                 Field1 = txt_entity2_field1.Text,
                 Field2 = txt_entity2_field2.Text
             });

3.datatable

T MathDynamicExpress.Core.DynamicExpress.Eval<T>(string expression, object entity)
例如(ex):
MathDynamicExpress.Core.DynamicExpress.Eval<int>("{0:0}+{0:1}-{1:1}", datatable1);

format:"{col-index or col-name:row-index}"

目前项目中提供了JS Provider使用了开源的V8Engine，在项目中使用是需要在webconfig中配置对应的provider

<configSections>
  <section name="dynamicExpressProvider" type="MathDynamicExpress.Core.DynamicExpressProviderSection, MathDynamicExpress.Core"/>
</configSections>
<dynamicExpressProvider defaultProvider="JsExpressBuilder">
  <providers>
    <add name="JsExpressBuilder" type="MathDynamicExpress.JSExpressBuilder,MathDynamicExpress"></add>
  </providers>
</dynamicExpressProvider>

另外需要设置一下兼容性：

<startup useLegacyV2RuntimeActivationPolicy="true">
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
<supportedRuntime version="v2.0.50727"/>
</startup>