我有一个页面上显示商店的列表，单击每个商店后，相应的类别和产品将显示在另一页的列表中。商店，类别和产品是使用Api调用显示的。我一切都正确，但是在商店页面和产品页面之间来回导航多次时，出现此错误：
Newtonsoft.Json.JsonReaderException: Unexpected character encountered
while parsing value: <. Path '', line 0, position 0.
使用断点，无法看到异常源。如何处理此异常？
编辑：我在异常发生之前就收到了这个html
[0:] <!doctype html>
<html lang="en">
<head>
<title>Too Many Requests</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<!-- Fonts -->
<link href="https://fonts.googleapis.com/css?family=Nunito" rel="stylesheet" type="text/css">
<!-- Styles -->
<style>
html {
line-height: 1.15;
-ms-text-size-adjust: 100%;
-webkit-text-size-adjust: 100%;
}
body {
margin: 0;
}
header,
nav,
section {
display: block;
}
figcaption,
main {
display: block;
}
a {
background-color: transparent;
-webkit-text-decoration-skip: objects;
}
strong {
font-weight: inherit;
}
strong {
font-weight: bolder;
}
code {
font-family: monospace, monospace;
font-size: 1em;
}
dfn {
font-style: italic;
}
svg:not(:root) {
overflow: hidden;
}
button,
input {
font-family: sans-serif;
font-size: 100%;
line-height: 1.15;
margin: 0;
}
button,
input {
overflow: visible;
}
button {
text-transform: none;
}
button,
html [type="button"],
[type="reset"],
[type="submit"] {
-webkit-appearance: button;
}
button::-moz-focus-inner,
[type="button"]::-moz-focus-inner,
[type="reset"]::-moz-focus-inner,
[type="submit"]::-moz-focus-inner {
border-style: none;
padding: 0;
}
button:-moz-focusring,
[type="button"]:-moz-focusring,
[type="reset"]:-moz-focusring,
[type="submit"]:-moz-focusring {
outline: 1px dotted ButtonText;
}
legend {
-webkit-box-sizing: border-box;
box-sizing: border-box;
color: inherit;
display: table;
max-width: 100%;
padding: 0;
white-space: normal;
}
[type="checkbox"],
[type="radio"] {
-webkit-box-sizing: border-box;
box-sizing: border-box;
padding: 0;
}
[type="number"]::-webkit-inner-spin-button,
[type="number"]::-webkit-outer-spin-button {
height: auto;
}
[type="search"] {
-webkit-appearance: textfield;
outline-offset: -2px;
}
[type="search"]::-webkit-search-cancel-button,
[type="search"]::-webkit-search-decoration {
-webkit-appearance: none;
}
::-webkit-file-upload-button {
-webkit-appearance: button;
font: inherit;
}
menu {
display: block;
}
canvas {
display: inline-block;
}
template {
display: none;
}
[hidden] {
display: none;
}
html {
-webkit-box-sizing: border-box;
box-sizing: border-box;
font-family: sans-serif;
}
*,
*::before,
*::after {
-webkit-box-sizing: inherit;
box-sizing: inherit;
}
p {
margin: 0;
}
button {
background: transparent;
padding: 0;
}
button:focus {
outline: 1px dotted;
outline: 5px auto -webkit-focus-ring-color;
}
*,
*::before,
*::after {
border-width: 0;
border-style: solid;
border-color: #dae1e7;
}
button,
[type="button"],
[type="reset"],
[type="submit"] {
border-radius: 0;
}
button,
input {
font-family: inherit;
}
input::-webkit-input-placeholder {
color: inherit;
opacity: .5;
}
input:-ms-input-placeholder {
color: inherit;
opacity: .5;
}
input::-ms-input-placeholder {
color: inherit;
opacity: .5;
}
input::placeholder {
color: inherit;
opacity: .5;
}
button,
[role=button] {
cursor: pointer;
}
.bg-transparent {
background-color: transparent;
}
.bg-white {
background-color: #fff;
}
.bg-teal-light {
background-color: #64d5ca;
}
.bg-blue-dark {
background-color: #2779bd;
}
.bg-indigo-light {
background-color: #7886d7;
}
.bg-purple-light {
background-color: #a779e9;
}
.bg-no-repeat {
background-repeat: no-repeat;
}
.bg-cover {
background-size: cover;
}
.border-grey-light {
border-color: #dae1e7;
}
.hover\:border-grey:hover {
border-color: #b8c2cc;
}
.rounded-lg {
border-radius: .5rem;
}
.border-2 {
border-width: 2px;
}
.hidden {
display: none;
}
.flex {
display: -webkit-box;
display: -ms-flexbox;
display: flex;
}
.items-center {
-webkit-box-align: center;
-ms-flex-align: center;
align-items: center;
}
.justify-center {
-webkit-box-pack: center;
-ms-flex-pack: center;
justify-content: center;
}
.font-sans {
font-family: Nunito, sans-serif;
}
.font-light {
font-weight: 300;
}
.font-bold {
font-weight: 700;
}
.font-black {
font-weight: 900;
}
.h-1 {
height: .25rem;
}
.leading-normal {
line-height: 1.5;
}
.m-8 {
margin: 2rem;
}
.my-3 {
margin-top: .75rem;
margin-bottom: .75rem;
}
.mb-8 {
margin-bottom: 2rem;
}
.max-w-sm {
max-width: 30rem;
}
.min-h-screen {
min-height: 100vh;
}
.py-3 {
padding-top: .75rem;
padding-bottom: .75rem;
}
.px-6 {
padding-left: 1.5rem;
padding-right: 1.5rem;
}
.pb-full {
padding-bottom: 100%;
}
.absolute {
position: absolute;
}
.relative {
position: relative;
}
.pin {
top: 0;
right: 0;
bottom: 0;
left: 0;
}
.text-black {
color: #22292f;
}
.text-grey-darkest {
color: #3d4852;
}
.text-grey-darker {
color: #606f7b;
}
.text-2xl {
font-size: 1.5rem;
}
.text-5xl {
font-size: 3rem;
}
.uppercase {
text-transform: uppercase;
}
.antialiased {
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
}
.tracking-wide {
letter-spacing: .05em;
}
.w-16 {
width: 4rem;
}
.w-full {
width: 100%;
}
@media (min-width: 768px) {
.md\:bg-left {
background-position: left;
}
.md\:bg-right {
background-position: right;
}
.md\:flex {
display: -webkit-box;
display: -ms-flexbox;
display: flex;
}
.md\:my-6 {
margin-top: 1.5rem;
margin-bottom: 1.5rem;
}
.md\:min-h-screen {
min-height: 100vh;
}
.md\:pb-0 {
padding-bottom: 0;
}
.md\:text-3xl {
font-size: 1.875rem;
}
.md\:text-15xl {
font-size: 9rem;
}
.md\:w-1\/2 {
width: 50%;
}
}
@media (min-width: 992px) {
.lg\:bg-center {
background-position: center;
}
}
</style>
</head>
<body class="antialiased font-sans">
<div class="md:flex min-h-screen">
<div class="w-full md:w-1/2 bg-white flex items-center justify-center">
<div class="max-w-sm m-8">
<div class="text-black text-5xl md:text-15xl font-black">
429 </div>
<div class="w-16 h-1 bg-purple-light my-3 md:my-6"></div>
<p class="text-grey-darker text-2xl md:text-3xl font-light mb-8 leading-normal">
Sorry, you are making too many requests to our servers. </p>
<a href="http://beta.cybasetech.com/hotcool">
<button class="bg-transparent text-grey-darkest font-bold uppercase tracking-wide py-3 px-6 border-2 border-grey-light hover:border-grey rounded-lg">
Go Home
</button>
</a>
</div>
</div>
<div class="relative pb-full md:flex md:pb-0 md:min-h-screen w-full md:w-1/2">
<div style="background-image: url('/svg/403.svg');" class="absolute pin bg-cover bg-no-repeat md:bg-left lg:bg-center">
</div>
</div>
</div>
</body>
</html>
答案 0 :(得分：1)
由于您发出过多请求，服务器返回错误。您应该检查HTTP请求的响应代码，如果它不是200，则不要尝试解析它。您可能还想尝试在本地缓存某些数据，这样就不会重复从服务器请求相同的数据。