What is the equivalent C# call for the Bitmap class for the BITMAP.IsLoaded call in VB6?

Question

我正在将 VB6 中的旧程序转换为 C# .NET Framework 4.8

我在 VB6 中有如下电话

Private m_FingerprintBmp As BITMAP
. . .
Set m_FingerprintBmp = New BITMAP
m_FingerprintBmp.LoadFromByteArray fingerprintByteArray
If m_FingerprintBmp.IsLoaded Then

在 C# 我已经转换如下

Bitmap m_FingerprintBmp;
. . .
m_FingerprintBmp = new Bitmap(); // Invalid no default ctor
m_FingerprintBmp.LoadFromByteArray(fingerprintByteArray);
if (m_FingerprintBmp.IsLoaded)

But there is no default constructor in.Net for Bitmap class and there is no LoadFromByteArray() method and no IsLoaded property or method for the Bitmap class in C# What would an equivalent call be in .NET?

[EDIT] What I have determined is that VB6 supports the concept of a BITMAP instance that doesn't have an image loaded but the .NET Bitmap class does not have a default constructor so it seems any .NET Bitmap instance must contain some form of bitmap image . 所以对于 .NET Bitmap class 不存在 IsLoaded 的概念。 所以我的结论是我应该使用 null 引用来指示未加载的 Bitmap 而不是没有图像的实例。

有人可以确认我的结论是正确的吗？

Answer 1

我会尝试使用Image.FromStream(new MemoryStream(fingerprintByteArray) 。如果数据适用于这个 class，你应该从中得到一个Image ，此时它已经完全加载。

请注意，您尝试使用的Bitmap来自 GDI+，这与BITMAP中的 BITMAP 不同。