您是否已验证您的方法确实成功并返回了正确的图像源?如果这样，重新分配Source应该没有问题.如果您将新创建的图像本身加载到UI中，它会保留其源代码吗?

Have you verified that your method actually succeeds and returns the correct image source? If it does there should be no problem reassigning Source. If you load the newly created image itself into the UI, does it retain its source?

this.Content = imgCreatedFromMethod;  // where "this" is the window

顺便说一句，没有必要实现自己的转换功能.如果您有一个可以用作XAML的字符串，则可以直接调用XAML解析器用来构建图像源的转换器:

By the way, it would not be necessary to implement your own conversion function. If you have a string that would be valid as XAML, you can directly call the converter that the XAML parser uses to build an image source:

using System.Globalization;
using System.Windows.Media;

string stringValue = ...

ImageSourceConverter converter = new ImageSourceConverter();
ImageSource imageSource = converter.ConvertFrom(
    null, CultureInfo.CurrentUICulture, stringValue);

System.ComponentModel.TypeDescriptor.GetConverter(typeof(TypeToConvertTo))也可以动态检索转换器实例(在这种情况下为ImageSourceConverter).

The converter instance (an ImageSourceConverter in this case) can also be retrieved dynamically by System.ComponentModel.TypeDescriptor.GetConverter(typeof(TypeToConvertTo)).

如果您使用数据绑定(如 TylerD87的答案)，此转换也将自动完成.您还可以查看触发器并以这种样式定义两个图像:

This conversion will also be done automatically if you use data-binding as in TylerD87's answer. You can also look into triggers and define both images in the style like this:

<Image>
    <Image.Style>
        <Style TargetType="Image">
            <Setter Property="Source" Value="original path" />
            <Style.Triggers>
                <Trigger ...>
                    <Setter Property="Source" Value="new path" />
                </Trigger>
            </Style.Triggers>
        </Style>
    </Image.Style>
</Image>