Question

以下代码可以正常工作：

public static void Main()
{
    Foo<int>(5);
}

private static void Foo<T>(T x)
{
    Bar((int)(object)x);
}

private static void Bar(int x)
{
}

但是，我的Bar方法来自第三方库（Json.NET），该库实现了多个重载。示例：

private static void Bar(string x)
{
}

如果我调用Foo<int>(5)，则Bar((int)(object)x)转换可以正常工作，但是调用Foo<string>("")会在运行时中断（由于明显的原因，您不能将字符串转换为int）。

因此，我想将Bar((int)(object)x)转换更改为通用Bar((T)(object)x)转换，但这会导致以下编译错误：

无法将“ T”转换为“ int”

那么，是否有可能将对象转换为T或唯一的解决方案是使用切换大小写转换？

Answer 1

该错误实际上意味着编译器不知道要调用GET : drives/[[REDACTED]]/root/search(q='testfile.txt') //HEADERS Content-Type = application/json; charset=utf-8 Authorization = REDACTED //BODY { "$select":"id,name,file" } //END RESPONSE 200 : 671ms //HEADERS Cache-Control = private request-id = 96015ad0-3a5b-46aa-80f4-f6d6d2c903ea Status_Code = 200 Http_Version = HTTP/1.1 Explanation = OK Strict-Transport-Security = max-age=31536000 Connection = close Transfer-Encoding = chunked Date = Thu, 04 Apr 2019 08:30:11 GMT Content-Type = application/json;odata.metadata=minimal;odata.streaming=true;IEEE754Compatible=false;charset=utf-8 Vary = Accept-Encoding OData-Version = 4.0 x-ms-ags-diagnostic = {"ServerInfo":{"DataCenter":"UK South","Slice":"SliceC","Ring":"5","ScaleUnit":"002","RoleInstance":"AGSFE_IN_1","ADSiteName":"UKS"}} client-request-id = 96015ad0-3a5b-46aa-80f4-f6d6d2c903ea Duration = 631.8379 //BODY { "@odata.context":"https://graph.microsoft.com/v1.0/$metadata#Collection(driveItem)", "@odata.nextLink":"https://graph.microsoft.com/v1.0/drives/[[REDACTED]]/root/search(q='testfile.txt')?$select=id%2cname%2cfile&$skiptoken=[[REDACTED]]", "value":[ { "@odata.type":"#microsoft.graph.driveItem", "id":"[[REDACTED]]", "name":"Other" }, { "@odata.type":"#microsoft.graph.driveItem", "id":"[[REDACTED]]", "name":"Sample file" }, { "@odata.type":"#microsoft.graph.driveItem", "id":"[[REDACTED]]", "name":"Business Contacts" }, { "@odata.type":"#microsoft.graph.driveItem", "id":"[[REDACTED]]", "name":"Training" }, { "@odata.type":"#microsoft.graph.driveItem", "id":"[[REDACTED]]", "name":"testfolders" }, { "@odata.type":"#microsoft.graph.driveItem", "id":"[[REDACTED]]", "name":"DD" }, { "@odata.type":"#microsoft.graph.driveItem", "id":"[[REDACTED]]", "name":"Club" }, { "@odata.type":"#microsoft.graph.driveItem", "id":"[[REDACTED]]", "name":"Calendar 2019.pdf", "file":{ "mimeType":"application/pdf" } }, { "@odata.type":"#microsoft.graph.driveItem", "id":"[[REDACTED]]", "name":"Quick Start Guide.pdf", "file":{ "mimeType":"application/pdf" } }, { "@odata.type":"#microsoft.graph.driveItem", "id":"[[REDACTED]]", "name":"Onboarding.pdf", "file":{ "mimeType":"application/pdf" } }, { "@odata.type":"#microsoft.graph.driveItem", "id":"[[REDACTED]]", "name":"Offices" }, { "@odata.type":"#microsoft.graph.driveItem", "id":"[[REDACTED]]", "name":"Office 1" }, { "@odata.type":"#microsoft.graph.driveItem", "id":"[[REDACTED]]", "name":"Data" }, { "@odata.type":"#microsoft.graph.driveItem", "id":"[[REDACTED]]", "name":"Sprints" }, { "@odata.type":"#microsoft.graph.driveItem", "id":"[[REDACTED]]", "name":"Meeting Minutes" }, { "@odata.type":"#microsoft.graph.driveItem", "id":"[[REDACTED]]", "name":"Reports" }, { "@odata.type":"#microsoft.graph.driveItem", "id":"[[REDACTED]]", "name":"IT" }, { "@odata.type":"#microsoft.graph.driveItem", "id":"[[REDACTED]]", "name":"General Documentation" }, { "@odata.type":"#microsoft.graph.driveItem", "id":"[[REDACTED]]", "name":"Marketing" }, { "@odata.type":"#microsoft.graph.driveItem", "id":"[[REDACTED]]", "name":"Video demos" }, { "@odata.type":"#microsoft.graph.driveItem", "id":"[[REDACTED]]", "name":"Training" }, { "@odata.type":"#microsoft.graph.driveItem", "id":"[[REDACTED]]", "name":"Others" }, { "@odata.type":"#microsoft.graph.driveItem", "id":"[[REDACTED]]", "name":"Scripts" }, { "@odata.type":"#microsoft.graph.driveItem", "id":"[[REDACTED]]", "name":"testfolder" }, { "@odata.type":"#microsoft.graph.driveItem", "id":"[[REDACTED]]", "name":"Emma" }, { "@odata.type":"#microsoft.graph.driveItem", "id":"[[REDACTED]]", "name":"Offices" }, { "@odata.type":"#microsoft.graph.driveItem", "id":"[[REDACTED]]", "name":"Offices" }, { "@odata.type":"#microsoft.graph.driveItem", "id":"[[REDACTED]]", "name":"Update September 2018.pdf", "file":{ "mimeType":"application/pdf" } }, { "@odata.type":"#microsoft.graph.driveItem", "id":"[[REDACTED]]", "name":"Office 2" }, { "@odata.type":"#microsoft.graph.driveItem", "id":"[[REDACTED]]", "name":"Office 3" }, { "@odata.type":"#microsoft.graph.driveItem", "id":"[[REDACTED]]", "name":"Office 4" }, { "@odata.type":"#microsoft.graph.driveItem", "id":"[[REDACTED]]", "name":"Office 5" }, { "@odata.type":"#microsoft.graph.driveItem", "id":"[[REDACTED]]", "name":"Office 6" }, { "@odata.type":"#microsoft.graph.driveItem", "id":"[[REDACTED]]", "name":"Meeting Minutes.pdf", "file":{ "mimeType":"application/pdf" } }, { "@odata.type":"#microsoft.graph.driveItem", "id":"[[REDACTED]]", "name":"Release Notes for Users" }, { "@odata.type":"#microsoft.graph.driveItem", "id":"[[REDACTED]]", "name":"Presentation" } And so on ... ] } //END的哪个重载，因为Bar在编译时可以是任何类型。

您需要在运行时检查T是T还是int并显式转换为所需的类型。

string

是否可以将对象转换为通用T？

1 个答案: