“无法将字符串转换为ImageSource."我怎样才能做到这一点? [英] "Cannot convert string to ImageSource." How can I do this?

问题描述

private void HeroMouseEnter(object sender, MouseEventArgs e)
    {
        ((Image)sender).Source = GetGlowingImage(((Image)sender).Name);            
    }

    public ImageSource GetGlowingImage(string name)
    {
        switch (name)
        {
            case "Andromeda":
                return "HeroGlowIcons/64px-Andromeda.gif";                
            default:
                return null;
        }
    }

我只是想让一个事件根据鼠标进入的位置更改图像.但是我无法完成这项工作.

我在Windows窗体中完成了此操作，并且按我的意愿100％工作.我该如何在WPF中翻译这样的内容?

void HeroMouseEnter(object sender, EventArgs e)
    {
        ((PictureBox)sender).Image = GetGlowingImage(((PictureBox)sender).Name);           
    }


    public Image GetGlowingImage(string name)
    {
        switch (name)
        {
            case "Andromeda":
                return Properties.Resources._64px_Andromedahero___copia;
            case "Engineer":
                return Properties.Resources._64px_Engineerhero___copia;
            default:
                return null;
        }
    }

解决方案

在您的GetGlowingImage()方法中，您需要生成一个新的ImageSource

此链接可能有帮助:在代码中设置WPF图像源

这里看到的区别是，在WindowsForms代码中，您具有Properties.Resources._64px_Andromedahero ___ copia是包含图像数据的Image变量的名称.在您的WPF代码中，字符串"filename ...."不是图像或图像源，它只是表示文件路径的字符串.您需要使用该路径加载图像文件.

我知道这没有意义，因为在设计时，您可以指定文件名并为您构建ImageSource.在代码中，您需要创建ImageSource(或派生对象，即BitmapSource)，并将适当的图像加载到其中.

，请尝试一下，未经测试(并检查上面的链接):

    public ImageSource GetGlowingImage(string name)
    {
        string fileName = string.Empty;

        switch (name)
        {
            case "Andromeda":
                {
                    fileName = "HeroGlowIcons/64px-Andromeda.gif";
                    break;
                }
        }

        BitmapImage glowIcon = new BitmapImage();


        glowIcon.BeginInit();
        glowIcon.UriSource = new Uri("pack://application:,,,/ApplicationName;component/" + fileName);
        glowIcon.EndInit();

        return glowIcon;
    }

private void HeroMouseEnter(object sender, MouseEventArgs e)
    {
        ((Image)sender).Source = GetGlowingImage(((Image)sender).Name);            
    }

    public ImageSource GetGlowingImage(string name)
    {
        switch (name)
        {
            case "Andromeda":
                return "HeroGlowIcons/64px-Andromeda.gif";                
            default:
                return null;
        }
    }

I'm just trying to make an event to change the image according to where the mouse entered. But I cannot make this work.

Edit: I did this in Windows Forms and it work 100% like I want it to. How could I translate something like this in WPF?

void HeroMouseEnter(object sender, EventArgs e)
    {
        ((PictureBox)sender).Image = GetGlowingImage(((PictureBox)sender).Name);           
    }


    public Image GetGlowingImage(string name)
    {
        switch (name)
        {
            case "Andromeda":
                return Properties.Resources._64px_Andromedahero___copia;
            case "Engineer":
                return Properties.Resources._64px_Engineerhero___copia;
            default:
                return null;
        }
    }

解决方案

In your GetGlowingImage() method you need to generate a new ImageSource

This link might help: Setting WPF image source in code

Edit:

See the difference here is that in the WindowsForms code you have the Properties.Resources._64px_Andromedahero___copia is the name of an Image variable that contains the image data. In your WPF code the string "filename...." is not an image or image source it's just a string that represents the path to the file. You need to load the image file using that path.

I know it doesn't make sense because at design time you can specify a filename and it builds the ImageSource for you. In code you need to create the ImageSource (or derived object, ie: BitmapSource) and load the appropriate image into it.

Edit: Try this, untested (and check my link above):

    public ImageSource GetGlowingImage(string name)
    {
        string fileName = string.Empty;

        switch (name)
        {
            case "Andromeda":
                {
                    fileName = "HeroGlowIcons/64px-Andromeda.gif";
                    break;
                }
        }

        BitmapImage glowIcon = new BitmapImage();


        glowIcon.BeginInit();
        glowIcon.UriSource = new Uri("pack://application:,,,/ApplicationName;component/" + fileName);
        glowIcon.EndInit();

        return glowIcon;
    }

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