C# String.Format（）上的方法名称应为错误

我最近开始学习c语言，之前没有编程经验，我创建了这个超级简单的脚本，用于计算窗口安装的材料成本，但是使用了字符串。Format{0:0.}Visual Studio给了我一个错误—“预期的方法名称”。任何帮助都会令人惊讶，因为我在任何地方都找不到足够具体的解决方案。请注意，它都包含在一个类和Main方法中，如果这可能会影响它的话

    Console.Write("How wide is the window in metres: ");
    decimal frameWidth = Convert.ToDecimal(Console.ReadLine());


    Console.Write("How tall is the window in metres? ");
    decimal frameHeight = Convert.ToDecimal(Console.ReadLine());

    decimal glassArea = (frameWidth *  frameHeight) ;
    decimal woodLength = (frameWidth * 2) + (frameHeight * 2);

    Console.WriteLine("You will need " + glassArea + "m squared of glass and " + woodLength + "m of wood.");

    Console.Write("What is the current cost of glass per square metre? £");
    decimal gCost = Convert.ToDecimal(Console.ReadLine());

    Console.Write("What is the current cost of wood per metre? £");
    decimal wCost = Convert.ToDecimal(Console.ReadLine());

    decimal totalCost = String.Format("{0:0.##}"((glassArea * gCost) + (woodLength * wCost)));
    Console.WriteLine("The total cost for the required materials is £" + totalCost );
    Console.WriteLine("Press any key to exit...");
    Console.ReadLine();

---

参数需要用逗号分隔，因此必须进行更改

decimal totalCost = String.Format("{0:0.##}"((glassArea * gCost) + (woodLength * wCost)));

进入

我没有检查其他错误。

缺少逗号

String.Format("{0:0.##}" ,//<--
             ((glassArea * gCost) + (woodLength * wCost)));

String.Format("{0:0.##}" ,//<--
             ((glassArea * gCost) + (woodLength * wCost)));