用几个包含字符串替换 base64 字符串的图像路径

Question

我有一个包含“https://tryout.pendukasi.id/upload/" and I want to replace every string that contains "https://tryout.pendukasi.id/upload/”到"data:image/jpeg; base64"的字符串。

代码：

foreach (StorageFile file in files)
{
    string soalP = file.Path;
    if (question.Pertanyaan.ToString().Contains("https://tryout.pendidikan.id/upload/"))
    {
        byte[] imageArray = System.IO.File.ReadAllBytes(soalP);
            string base64ImageRepresentation = Convert.ToBase64String(imageArray);
            soal = Regex.Replace(question.Pertanyaan.ToString(), "\"https://tryout.pendidikan.id/upload/" + file.Name + "\"", "data:image/jpeg;base64," + base64ImageRepresentation);
    }
}

我有一个问题，如果字符串包含一个“https://tryout.pendukasi.id/upload/", then the string is successfully replaced, but if it contains several "https://tryout.pendukasi.id/upload/”，例如："Perhatikan ayat-ayat Surat al-Falaq berikut ini! <img src=\"https://tryout.pendidikan.id/upload/3-1.JPG\" /> <img src=\"https://tryout.pendidikan.id/upload/3-2.JPG\" /> <img src=\"https://tryout.pendidikan.id/upload/3-3.JPG\" /> <img src=\"https://tryout.pendidikan.id/upload/3-4.JPG\" /> <img src=\"https://tryout.pendidikan.id/upload/3-5.JPG\" /> Urutan ayat dalam Surat al-Falaq yang benar adalah …."，则字符串没有成功更改。如何解决这个问题？

Answer 1

发生这种情况是因为您正在逐个文件替换它，并且它之前的更改不断被更改：

soal = Regex.Replace(question.Pertanyaan.ToString(), "\"https://tryout.pendidikan.id/upload/" + file.Name + "\"", "data:image/jpeg;base64," + base64ImageRepresentation);

一种方法是将您的正则表达式替换字符串保存到一个变量中。这样，您的替换内容就不会被覆盖：

string soal = question.Pertanyaan.ToString();

foreach (StorageFile file in files)
{
    string soalP = file.Path;
    if (soal.Contains("https://tryout.pendidikan.id/upload/"))
    {
        byte[] imageArray = System.IO.File.ReadAllBytes(soalP);
            string base64ImageRepresentation = Convert.ToBase64String(imageArray);
            soal = Regex.Replace(soal, "\"https://tryout.pendidikan.id/upload/" + file.Name + "\"", "data:image/jpeg;base64," + base64ImageRepresentation);
    }
}

用几个包含字符串替换 base64 字符串的图像路径

Replace image path to base64 string with several containing string

c#

string

uwp

tobase64string