[英]Why does my code say System.FormatException: 'Input string was not in a correct format.' when I leave the text box blank and click the submit button?
[英]Why does Visual Studio say my input string is not in a correct format?
如下代碼:
string year = textBoxYear.Text;
string award = comboBoxAwards.Text;
string cat = comboBoxCategory.Text;
string title = textBoxTitle.Text;
string author = textBoxAuthor.Text;
string kindleASIN = textBoxKindleASIN.Text;
string hardboundASIN = textBoxHardboundASIN.Text;
string paperbackASIN = textBoxPaperbackASIN.Text;
string imgSrc = getImgSrc(kindleASIN, hardboundASIN, paperbackASIN);
string newRec = // Keeping year as int for LINQ querying (where year > or < such and such), and yearDisplay spans two years for some awards
string.Format(
"new BookClass{Award=\"{0}\", Year={1}, YearDisplay=\"{1}\", Category=\"{2}\", Title=\"{3}\", Author=\"{4}\", KindleASIN=\"{5}\", HardboundASIN=\"{6}\", PaperbackASIN=\"{7}\", ImgSrc=\"{8}\"},", award, year, cat, title, author, kindleASIN, hardboundASIN, paperbackASIN, imgSrc);
...使用此數據:
year = "2013"
award = "Hugos"
cat = "Best Novel"
title == "Redshirts"
author == "John Scalzi"
kindleASIN == "B0079XPUOW"
hardboundASIN == "0765316994"
paperbackASIN == "0765334798"
imgSrc == "http://images.amazon.com/images/P/B0079XPUOW.01.MZZZZZZZ"
...在分配給imgSrc時死於,說:“ 未處理System.FormatException HResult = -2146233033消息=輸入字符串的格式不正確 ”。
...並且“疑難解答提示”說,“ 將字符串轉換為DateTime時,在將每個變量放入DateTime對象之前,分析該字符串以獲取日期。 ”
但是我沒有將字符串轉換為DateTime ...可能是什么問題?
不是替換令牌的花括號將其弄亂了
new BookClass{Award=\"{0}\", Year={1}, YearDisplay=\"{1}\" here --^
您需要通過將它們加倍來轉義使用的任何{
或}
,它們在Format
函數處理字符串后將顯示為單個花括號。
string.Format(
"new BookClass{{Award=\"{0}\", Year={1}, YearDisplay=\"{1}\", Category=\"{2}\", Title=\"{3}\", Author=\"{4}\", KindleASIN=\"{5}\", HardboundASIN=\"{6}\", PaperbackASIN=\"{7}\", ImgSrc=\"{8}\"}},", award, year, cat, title, author, kindleASIN, hardboundASIN, paperbackASIN, imgSrc);
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