如何在 C# 中将 Decimal 转换为 Double?

问题描述

我想使用 Track-Bar 来更改 Form 的不透明度.

这是我的代码:

十进制 trans = trackBar1.Value/5000;this.Opacity = 反式；

当我构建应用程序时，它给出了以下错误:

不能将十进制类型隐式转换为双精度

我曾尝试使用 trans 和 double，但随后 Control 不起作用.此代码在过去的 VB.NET 项目中运行良好.

不需要像这样显式转换为 double:

double trans = (double) trackBar1.Value/5000.0;

将常量标识为5000.0(或5000d)就足够了:

double trans = trackBar1.Value/5000.0;双反 = trackBar1.Value/5000d;

I want to use a Track-Bar to change a Form's opacity.

This is my code:

decimal trans = trackBar1.Value / 5000;
this.Opacity = trans;

When I build the application, it gives the following error:

Cannot implicitly convert type decimal to double

I have tried using trans and double, but then the Control doesn't work. This code worked fine in a past VB.NET project.

An explicit cast to double like this isn't necessary:

double trans = (double) trackBar1.Value / 5000.0;

Identifying the constant as 5000.0 (or as 5000d) is sufficient:

double trans = trackBar1.Value / 5000.0;
double trans = trackBar1.Value / 5000d;

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