1.使用 

using Microsoft.CodeAnalysis.CSharp.Scripting;
using Microsoft.CodeAnalysis.Scripting;

2.定义 RoslynHelper 类, 添加一个 DataTable GetTableBySql(string sql = "") 方法

3. 先定义 待执行的  C# 脚本方法 

比如执行一个sql语句, 得到查询的结果集 DataTable 

==>去动态执行 Common.RoslynHelper().GetTableBySql(sql) 方法

string  = @"

using System;
using YXTASK.Common;
public class ScriptedClass
{
public System.Data.DataTable DataRes { get; set; }

public ScriptedClass()
{
string sql= "" select * from (select id,age.name  from StudentInfo) where age<=20"";
this.DataRes = new Common.RoslynHelper().GetTableBySql(sql);
}
}

";

4.调用

   1>传入需要注入的命名空间 

      var scriptOptions = ScriptOptions.Default.AddReferences(typeof(System.Data.DataTable).Assembly, typeof(RoslynHelper).Assembly);

   2>传入待执行的C# 文本

      var script1  = CSharpScript.RunAsync(code1, scriptOptions).Result;

   3>执行脚本

      var result1 =  script1.ContinueWithAsync<System.Data.DataTable>("new ScriptedClass().DataRes").Result;

   4>得到返回值

      DataTable   res =  result1.ReturnValue;

    try
    {
        var scriptOptions = ScriptOptions.Default.AddReferences(typeof(System.Data.DataTable).Assembly, typeof(RoslynHelper).Assembly);
        var script1 = CSharpScript.RunAsync(code1, scriptOptions).Result;
        var result1 = script1.ContinueWithAsync<System.Data.DataTable>("new ScriptedClass().DataRes").Result;
        res = result1.ReturnValue;
        Console.WriteLine(res.Rows.Count);
        Console.WriteLine("");
    }
    catch (Exception ex)
    {
        Console.WriteLine(ex.Message);
        Console.WriteLine(ex.StackTrace);
        Console.WriteLine("");
    }