C# 公式計算(字符串)

1）調用JS計算方法（不推薦，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）構建DataTable，給列名添加公式

//計算公式string exPRession1 = "a+b*(c-d)";string expression2 = "a+b-c-d";//構建tableDataTable 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;//添加一行并賦值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");}