使用C#将字符串转换为float [英] Convert string to float using c#

问题描述

如何将字符串转换为浮点数.

我必须使用它来设置Label的大小

How to convert string to float.

i have to use it to set the size of Label

this.lblComanyName.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));

推荐答案

这不是转换"(这是CodeProject查询者的真实诅咒，我不知道为什么)，这是解析" :
http://msdn.microsoft.com/en-us/library/fd84bdyt.aspx [ ^ ]，
http://msdn.microsoft.com/en-us/library/7yd1h1be.aspx [ ^ ]，
http://msdn.microsoft.com/en-us/library/t9ebt447.aspx [ ^ ]，
http://msdn.microsoft.com/en-us/library/0kb11ck8.aspx [ ^ ]，
http://msdn.microsoft.com/en-us/library/994c0zb1.​​aspx [ ^ ]，
http://msdn.microsoft.com/en-us/library/3s27fasw.aspx [ ^ ].

是的，对于大多数应用程序，您确实要使用double，而不是Single.对于System.Single(别名float)，所有方法都相同:
http://msdn.microsoft.com/en-us/library/system.single.aspx [ ^ ].

方法的尝试…"形式的不同之处在于，它们永远不会引发异常. (它们不会抛出异常，然后按照我的想法捕获，它们根本不会抛出；我通过源代码检查了该实现细节.)相反，您检查返回值以查看是否解析成功与否.

—SA

This not "convert" (this word is a real curse of CodeProject inquirers, I don''t know why), this is "parse":
http://msdn.microsoft.com/en-us/library/fd84bdyt.aspx[^],
http://msdn.microsoft.com/en-us/library/7yd1h1be.aspx[^],
http://msdn.microsoft.com/en-us/library/t9ebt447.aspx[^],
http://msdn.microsoft.com/en-us/library/0kb11ck8.aspx[^],
http://msdn.microsoft.com/en-us/library/994c0zb1.aspx[^],
http://msdn.microsoft.com/en-us/library/3s27fasw.aspx[^].

And yes, for most applications you really want to use double, not Single. For System.Single (alias float), all methods are the same:
http://msdn.microsoft.com/en-us/library/system.single.aspx[^].

The difference the "Try…" forms of methods make is that they do not throw exceptions, ever. (They do not throw and then catch as I thought, they don''t throw at all; I checked up this implementation detail by source code.) Instead, you check up the return values to see if the parsing is successful or not.

—SA

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