DataTable 转 Json
string json = JsonConvert.SerializeObject(dt, Formatting.Indented, timeFormat);
拼接json字符串：
var text_json = "[{'SPI_ProgramTitle':'" + data.Rows[0]["SPI_ProgramTitle"].ToString() + "','SPI_ProgramPhoto':'" +
data.Rows[0]["SPI_ProgramPhoto"].ToString() + "','UI_UserName':'" + data.Rows[0]["UI_UserName"] +
"','SPI_ProgramTag':'" + data.Rows[0]["SPI_ProgramTag"].ToString() + "','SPI_ProgramDefinedTag':'" +
data.Rows[0]["SPI_ProgramDefinedTag"].ToString() + "','Price':'" + Price + "','ProgramMoeny':'" +
ProgramMoeny + "','Plan':'" + Plan + "','SupportingNo':'" + SupportingNo + "','SurplusTime':'" +
SurplusTime + "','UI_UserPic':'" + data.Rows[0]["UI_UserPic"].ToString() + "','SPI_ProgramGoal':'" +
data.Rows[0]["SPI_ProgramGoal"] + "','SPI_ProgramDescribe':'" + data.Rows[0]["SPI_ProgramDescribe"] +
"','SPI_ProgramState':'" + data.Rows[0]["SPI_ProgramState"] + "'}]";
data.Rows[0]["SPI_ProgramPhoto"].ToString() + "','UI_UserName':'" + data.Rows[0]["UI_UserName"] +
"','SPI_ProgramTag':'" + data.Rows[0]["SPI_ProgramTag"].ToString() + "','SPI_ProgramDefinedTag':'" +
data.Rows[0]["SPI_ProgramDefinedTag"].ToString() + "','Price':'" + Price + "','ProgramMoeny':'" +
ProgramMoeny + "','Plan':'" + Plan + "','SupportingNo':'" + SupportingNo + "','SurplusTime':'" +
SurplusTime + "','UI_UserPic':'" + data.Rows[0]["UI_UserPic"].ToString() + "','SPI_ProgramGoal':'" +
data.Rows[0]["SPI_ProgramGoal"] + "','SPI_ProgramDescribe':'" + data.Rows[0]["SPI_ProgramDescribe"] +
"','SPI_ProgramState':'" + data.Rows[0]["SPI_ProgramState"] + "'}]";
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