我正在构建一个应用程序，该应用程序以 JSON 格式在Assets文件夹中存储了一些数据。现在，当我的应用程序满足特定要求时，它应该读取文件，反序列化并显示数据。
这是我编写的代码-
StorageFile file = await StorageFile.GetFileFromPathAsync(@"Assets\appleTree.json");
string data = await FileIO.ReadTextAsync(file);
var serializer = new DataContractJsonSerializer(typeof(DataModel));
var ms = new MemoryStream(Encoding.UTF8.GetBytes(data));
var result = (DataModel)serializer.ReadObject(ms);
问题是，在第1行，程序抛出此异常-
值不在预期范围内
如何解决此问题？
在此发布之前，我在线搜索，找不到满意的答案。
答案 0 :(得分：1)
您需要使用// We're going to read 83 edges:
// - First a FALLING, RISING, and FALLING edge for the start bit
// - Then 40 bits: RISING and then a FALLING edge per bit
// To keep our code simple, we accept any HIGH or LOW reading if it's max 85 usecs long
uint16_t rawHumidity = 0;
uint16_t rawTemperature = 0;
uint16_t data = 0;
for ( int8_t i = -3 ; i < 2 * 40; i++ ) {
byte age;
startTime = micros();
do {
age = (unsigned long)(micros() - startTime);
if ( age > 90 ) {
error = ERROR_TIMEOUT;
return;
}
} while ( digitalRead(pin) == (i & 1) ? HIGH : LOW );
if ( i >= 0 && (i & 1) ) {
// Now we are being fed our 40 bits
data <<= 1;
// A zero max 30 usecs, a one at least 68 usecs.
if ( age > 30 ) {
data |= 1; // we got a one
}
}
switch ( i ) {
case 31:
rawHumidity = data;
break;
case 63:
rawTemperature = data;
data = 0;
break;
}
}
// Verify checksum
if ( (byte)(((byte)rawHumidity) + (rawHumidity >> 8) + ((byte)rawTemperature) + (rawTemperature >> 8)) != data ) {
error = ERROR_CHECKSUM;
return;
}
（here）方法访问StorageFile.GetFileFromApplicationUriAsync文件夹。例如：
Assets