C# 公式计算(字符串)

 

1）调用JS计算方法（不推荐，效率低）

MSScriptControl.ScriptControl scriptControl = new MSScriptControl.ScriptControl();

scriptControl.Language = "JScript";

string value = scriptControl.Eval("1+2*(4-3)").ToString();

Console.WriteLine(value);

 

2）使用DataTable的Compute()方法

DataTable table = new DataTable();

string value = table.Compute("1+2*(4-3)", "").ToString();

Console.WriteLine(value);

 

3）构建DataTable，给列名添加公式

//计算公式

string expression1 = "a+b*(c-d)";

string expression2 = "a+b-c-d";



//构建table

DataTable table = new DataTable();

table.Columns.Add("a", typeof(int));

table.Columns.Add("b", typeof(int));

table.Columns.Add("c", typeof(int));

table.Columns.Add("d", typeof(int));

table.Columns.Add("e1", typeof(int));//公式列

table.Columns.Add("e2", typeof(int));//公式列



//添加公式

table.Columns["e1"].Expression = expression1;

table.Columns["e2"].Expression = expression2;



//添加一行并赋值

DataRow row = table.Rows.Add();

row["a"] = 1;

row["b"] = 2;

row["c"] = 4;

row["d"] = 3;



table.BeginLoadData();

table.EndLoadData();



for (int i = 0; i < table.Columns.Count; i++)

{

Console.Write(table.Columns[i].ColumnName + "\t");

}



Console.WriteLine();



for (int i = 0; i < table.Columns.Count; i++)

{

Console.Write(row[i].ToString() + "\t");

}