不能初始化var变量多次(cant initialize var variable more than once)

不能初始化var变量多次(cant initialize var variable more than once)

您好我有一个var变量，我需要初始化它基于if语句这是我的代码：

var series = new ColumnSeries{}; if(integer == 0) series = new LineSeries{}; else if (integer == 1) series = new PieSeries{}; else if (integer == 2) series = new AreaSeries{};

但它得到错误，我不能初始化变量不止一次，所以我怎么可以不止一次初始化这个变量？ 我需要根据if语句改变我的图表类型，所以我尝试了这种方式。

hi i have a var variable and i need initialize it based on if statement this is my code:

var series = new ColumnSeries{}; if(integer == 0) series = new LineSeries{}; else if (integer == 1) series = new PieSeries{}; else if (integer == 2) series = new AreaSeries{};

but it get error that i cant initialize variable more than once, so how i can initialize this variable more than once? i need change my chart type based on if statement so i tried this way.

最满意答案

var是隐式类型; 在你的情况下，它假定它应该是一个ColumnSeries 。

要使用基类（因此可以将其他派生类分配给它），可以投射已初始化的对象或不使用var。

Series series = new ColumnSeries(); //Preferred. var is just a bad choice here var series = (Series)new ColumnSeries();

var is implicit typing; in your case it assumes that it should be a ColumnSeries.

To use a base class (so other derived classes can be assigned to it) you could cast the initialized object or just don't use var.

Series series = new ColumnSeries(); //Preferred. var is just a bad choice here var series = (Series)new ColumnSeries();